Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
  firewire: Add more documentation to firewire-cdev.h
  firewire: fix ioctl() return code
  firewire: fix setting tag and sy in iso transmission
  firewire: fw-sbp2: fix another small generation access bug
  firewire: fw-sbp2: enforce s/g segment size limit
  firewire: fw_send_request_sync()
  ieee1394: survive a few seconds connection loss
  ieee1394: nodemgr clean up class iterators
  ieee1394: dv1394, video1394: remove unnecessary expressions
  ieee1394: raw1394: make write() thread-safe
  ieee1394: raw1394: narrow down the state_mutex protected region
  ieee1394: raw1394: replace BKL by local mutex, make ioctl() and mmap() thread-safe
  ieee1394: sbp2: enforce s/g segment size limit
  ieee1394: sbp2: check for DMA mapping failures
  ieee1394: sbp2: stricter dma_sync
  ieee1394: Use DIV_ROUND_UP

drivers/firewire/fw-card.c

@@ -189,39 +189,16 @@ static const char gap_count_table[] = {
 	63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40
 };
 
-struct bm_data {
-	struct fw_transaction t;
-	struct {
-		__be32 arg;
-		__be32 data;
-	} lock;
-	u32 old;
-	int rcode;
-	struct completion done;
-};
-
-static void
-complete_bm_lock(struct fw_card *card, int rcode,
-		 void *payload, size_t length, void *data)
-{
-	struct bm_data *bmd = data;
-
-	if (rcode == RCODE_COMPLETE)
-		bmd->old = be32_to_cpu(*(__be32 *) payload);
-	bmd->rcode = rcode;
-	complete(&bmd->done);
-}
-
 static void
 fw_card_bm_work(struct work_struct *work)
 {
 	struct fw_card *card = container_of(work, struct fw_card, work.work);
 	struct fw_device *root_device;
 	struct fw_node *root_node, *local_node;
-	struct bm_data bmd;
 	unsigned long flags;
-	int root_id, new_root_id, irm_id, gap_count, generation, grace;
+	int root_id, new_root_id, irm_id, gap_count, generation, grace, rcode;
 	bool do_reset = false;
+	__be32 lock_data[2];
 
 	spin_lock_irqsave(&card->lock, flags);
 	local_node = card->local_node;
@@ -263,33 +240,28 @@ fw_card_bm_work(struct work_struct *work)
 			goto pick_me;
 		}
 
-		bmd.lock.arg = cpu_to_be32(0x3f);
-		bmd.lock.data = cpu_to_be32(local_node->node_id);
+		lock_data[0] = cpu_to_be32(0x3f);
+		lock_data[1] = cpu_to_be32(local_node->node_id);
 
 		spin_unlock_irqrestore(&card->lock, flags);
 
-		init_completion(&bmd.done);
-		fw_send_request(card, &bmd.t, TCODE_LOCK_COMPARE_SWAP,
-				irm_id, generation,
-				SCODE_100, CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID,
-				&bmd.lock, sizeof(bmd.lock),
-				complete_bm_lock, &bmd);
-		wait_for_completion(&bmd.done);
+		rcode = fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
+				irm_id, generation, SCODE_100,
+				CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID,
+				lock_data, sizeof(lock_data));
 
-		if (bmd.rcode == RCODE_GENERATION) {
-			/*
-			 * Another bus reset happened. Just return,
-			 * the BM work has been rescheduled.
-			 */
+		if (rcode == RCODE_GENERATION)
+			/* Another bus reset, BM work has been rescheduled. */
 			goto out;
-		}
 
-		if (bmd.rcode == RCODE_COMPLETE && bmd.old != 0x3f)
+		if (rcode == RCODE_COMPLETE &&
+		    lock_data[0] != cpu_to_be32(0x3f))
 			/* Somebody else is BM, let them do the work. */
 			goto out;
 
 		spin_lock_irqsave(&card->lock, flags);
-		if (bmd.rcode != RCODE_COMPLETE) {
+
+		if (rcode != RCODE_COMPLETE) {
 			/*
 			 * The lock request failed, maybe the IRM
 			 * isn't really IRM capable after all. Let's

drivers/firewire/fw-cdev.c

@@ -720,8 +720,8 @@ static int ioctl_create_iso_context(struct client *client, void *buffer)
 #define GET_PAYLOAD_LENGTH(v)	((v) & 0xffff)
 #define GET_INTERRUPT(v)	(((v) >> 16) & 0x01)
 #define GET_SKIP(v)		(((v) >> 17) & 0x01)
-#define GET_TAG(v)		(((v) >> 18) & 0x02)
-#define GET_SY(v)		(((v) >> 20) & 0x04)
+#define GET_TAG(v)		(((v) >> 18) & 0x03)
+#define GET_SY(v)		(((v) >> 20) & 0x0f)
 #define GET_HEADER_LENGTH(v)	(((v) >> 24) & 0xff)
 
 static int ioctl_queue_iso(struct client *client, void *buffer)
@@ -913,7 +913,7 @@ dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg)
 			return -EFAULT;
 	}
 
-	return 0;
+	return retval;
 }
 
 static long

drivers/firewire/fw-device.c

@@ -381,46 +381,21 @@ static struct device_attribute fw_device_attributes[] = {
 	__ATTR_NULL,
 };
 
-struct read_quadlet_callback_data {
-	struct completion done;
-	int rcode;
-	u32 data;
-};
-
-static void
-complete_transaction(struct fw_card *card, int rcode,
-		     void *payload, size_t length, void *data)
-{
-	struct read_quadlet_callback_data *callback_data = data;
-
-	if (rcode == RCODE_COMPLETE)
-		callback_data->data = be32_to_cpu(*(__be32 *)payload);
-	callback_data->rcode = rcode;
-	complete(&callback_data->done);
-}
-
 static int
 read_rom(struct fw_device *device, int generation, int index, u32 *data)
 {
-	struct read_quadlet_callback_data callback_data;
-	struct fw_transaction t;
-	u64 offset;
+	int rcode;
 
 	/* device->node_id, accessed below, must not be older than generation */
 	smp_rmb();
 
-	init_completion(&callback_data.done);
-
-	offset = (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4;
-	fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST,
+	rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST,
 			device->node_id, generation, device->max_speed,
-			offset, NULL, 4, complete_transaction, &callback_data);
-
-	wait_for_completion(&callback_data.done);
-
-	*data = callback_data.data;
+			(CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4,
+			data, 4);
+	be32_to_cpus(data);
 
-	return callback_data.rcode;
+	return rcode;
 }
 
 #define READ_BIB_ROM_SIZE	256

drivers/firewire/fw-sbp2.c

@@ -29,6 +29,7 @@
  */
 
 #include <linux/blkdev.h>
+#include <linux/bug.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
@@ -181,10 +182,16 @@ struct sbp2_target {
 #define SBP2_MAX_LOGIN_ORB_TIMEOUT	40000U	/* Timeout in ms */
 #define SBP2_ORB_TIMEOUT		2000U	/* Timeout in ms */
 #define SBP2_ORB_NULL			0x80000000
-#define SBP2_MAX_SG_ELEMENT_LENGTH	0xf000
 #define SBP2_RETRY_LIMIT		0xf		/* 15 retries */
 #define SBP2_CYCLE_LIMIT		(0xc8 << 12)	/* 200 125us cycles */
 
+/*
+ * The default maximum s/g segment size of a FireWire controller is
+ * usually 0x10000, but SBP-2 only allows 0xffff. Since buffers have to
+ * be quadlet-aligned, we set the length limit to 0xffff & ~3.
+ */
+#define SBP2_MAX_SEG_SIZE		0xfffc
+
 /* Unit directory keys */
 #define SBP2_CSR_UNIT_CHARACTERISTICS	0x3a
 #define SBP2_CSR_FIRMWARE_REVISION	0x3c
@@ -621,25 +628,15 @@ sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id,
 	return retval;
 }
 
-static void
-complete_agent_reset_write(struct fw_card *card, int rcode,
-			   void *payload, size_t length, void *done)
-{
-	complete(done);
-}
-
 static void sbp2_agent_reset(struct sbp2_logical_unit *lu)
 {
 	struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
-	DECLARE_COMPLETION_ONSTACK(done);
-	struct fw_transaction t;
-	static u32 z;
+	__be32 d = 0;
 
-	fw_send_request(device->card, &t, TCODE_WRITE_QUADLET_REQUEST,
+	fw_run_transaction(device->card, TCODE_WRITE_QUADLET_REQUEST,
 			   lu->tgt->node_id, lu->generation, device->max_speed,
 			   lu->command_block_agent_address + SBP2_AGENT_RESET,
-			&z, sizeof(z), complete_agent_reset_write, &done);
-	wait_for_completion(&done);
+			   &d, sizeof(d));
 }
 
 static void
@@ -653,7 +650,7 @@ static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu)
 {
 	struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
 	struct fw_transaction *t;
-	static u32 z;
+	static __be32 d;
 
 	t = kmalloc(sizeof(*t), GFP_ATOMIC);
 	if (t == NULL)
@@ -662,7 +659,7 @@ static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu)
 	fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
 			lu->tgt->node_id, lu->generation, device->max_speed,
 			lu->command_block_agent_address + SBP2_AGENT_RESET,
-			&z, sizeof(z), complete_agent_reset_write_no_wait, t);
+			&d, sizeof(d), complete_agent_reset_write_no_wait, t);
 }
 
 static void sbp2_set_generation(struct sbp2_logical_unit *lu, int generation)
@@ -823,13 +820,6 @@ static void sbp2_target_put(struct sbp2_target *tgt)
 	kref_put(&tgt->kref, sbp2_release_target);
 }
 
-static void
-complete_set_busy_timeout(struct fw_card *card, int rcode,
-			  void *payload, size_t length, void *done)
-{
-	complete(done);
-}
-
 /*
  * Write retransmit retry values into the BUSY_TIMEOUT register.
  * - The single-phase retry protocol is supported by all SBP-2 devices, but the
@@ -849,17 +839,12 @@ complete_set_busy_timeout(struct fw_card *card, int rcode,
 static void sbp2_set_busy_timeout(struct sbp2_logical_unit *lu)
 {
 	struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
-	DECLARE_COMPLETION_ONSTACK(done);
-	struct fw_transaction t;
-	static __be32 busy_timeout;
+	__be32 d = cpu_to_be32(SBP2_CYCLE_LIMIT | SBP2_RETRY_LIMIT);
 
-	busy_timeout = cpu_to_be32(SBP2_CYCLE_LIMIT | SBP2_RETRY_LIMIT);
-
-	fw_send_request(device->card, &t, TCODE_WRITE_QUADLET_REQUEST,
+	fw_run_transaction(device->card, TCODE_WRITE_QUADLET_REQUEST,
 			   lu->tgt->node_id, lu->generation, device->max_speed,
-			CSR_REGISTER_BASE + CSR_BUSY_TIMEOUT, &busy_timeout,
-			sizeof(busy_timeout), complete_set_busy_timeout, &done);
-	wait_for_completion(&done);
+			   CSR_REGISTER_BASE + CSR_BUSY_TIMEOUT,
+			   &d, sizeof(d));
 }
 
 static void sbp2_reconnect(struct work_struct *work);
@@ -1121,6 +1106,10 @@ static int sbp2_probe(struct device *dev)
 	struct Scsi_Host *shost;
 	u32 model, firmware_revision;
 
+	if (dma_get_max_seg_size(device->card->device) > SBP2_MAX_SEG_SIZE)
+		BUG_ON(dma_set_max_seg_size(device->card->device,
+					    SBP2_MAX_SEG_SIZE));
+
 	shost = scsi_host_alloc(&scsi_driver_template, sizeof(*tgt));
 	if (shost == NULL)
 		return -ENOMEM;
@@ -1369,14 +1358,12 @@ static int
 sbp2_map_scatterlist(struct sbp2_command_orb *orb, struct fw_device *device,
 		     struct sbp2_logical_unit *lu)
 {
-	struct scatterlist *sg;
-	int sg_len, l, i, j, count;
-	dma_addr_t sg_addr;
+	struct scatterlist *sg = scsi_sglist(orb->cmd);
+	int i, n;
 
-	sg = scsi_sglist(orb->cmd);
-	count = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
+	n = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
 		       orb->cmd->sc_data_direction);
-	if (count == 0)
+	if (n == 0)
 		goto fail;
 
 	/*
@@ -1386,7 +1373,7 @@ sbp2_map_scatterlist(struct sbp2_command_orb *orb, struct fw_device *device,
 	 * as the second generation iPod which doesn't support page
 	 * tables.
 	 */
-	if (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) {
+	if (n == 1) {
 		orb->request.data_descriptor.high =
 			cpu_to_be32(lu->tgt->address_high);
 		orb->request.data_descriptor.low  =
@@ -1396,29 +1383,9 @@ sbp2_map_scatterlist(struct sbp2_command_orb *orb, struct fw_device *device,
 		return 0;
 	}
 
-	/*
-	 * Convert the scatterlist to an sbp2 page table.  If any
-	 * scatterlist entries are too big for sbp2, we split them as we
-	 * go.  Even if we ask the block I/O layer to not give us sg
-	 * elements larger than 65535 bytes, some IOMMUs may merge sg elements
-	 * during DMA mapping, and Linux currently doesn't prevent this.
-	 */
-	for (i = 0, j = 0; i < count; i++, sg = sg_next(sg)) {
-		sg_len = sg_dma_len(sg);
-		sg_addr = sg_dma_address(sg);
-		while (sg_len) {
-			/* FIXME: This won't get us out of the pinch. */
-			if (unlikely(j >= ARRAY_SIZE(orb->page_table))) {
-				fw_error("page table overflow\n");
-				goto fail_page_table;
-			}
-			l = min(sg_len, SBP2_MAX_SG_ELEMENT_LENGTH);
-			orb->page_table[j].low = cpu_to_be32(sg_addr);
-			orb->page_table[j].high = cpu_to_be32(l << 16);
-			sg_addr += l;
-			sg_len -= l;
-			j++;
-		}
+	for_each_sg(sg, sg, n, i) {
+		orb->page_table[i].high = cpu_to_be32(sg_dma_len(sg) << 16);
+		orb->page_table[i].low = cpu_to_be32(sg_dma_address(sg));
 	}
 
 	orb->page_table_bus =
@@ -1437,13 +1404,13 @@ sbp2_map_scatterlist(struct sbp2_command_orb *orb, struct fw_device *device,
 	orb->request.data_descriptor.high = cpu_to_be32(lu->tgt->address_high);
 	orb->request.data_descriptor.low  = cpu_to_be32(orb->page_table_bus);
 	orb->request.misc |= cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT |
-					 COMMAND_ORB_DATA_SIZE(j));
+					 COMMAND_ORB_DATA_SIZE(n));
 
 	return 0;
 
  fail_page_table:
-	dma_unmap_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
-		     orb->cmd->sc_data_direction);
+	dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd),
+		     scsi_sg_count(orb->cmd), orb->cmd->sc_data_direction);
  fail:
 	return -ENOMEM;
 }
@@ -1456,7 +1423,7 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
 	struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
 	struct sbp2_command_orb *orb;
 	unsigned int max_payload;
-	int retval = SCSI_MLQUEUE_HOST_BUSY;
+	int generation, retval = SCSI_MLQUEUE_HOST_BUSY;
 
 	/*
 	 * Bidirectional commands are not yet implemented, and unknown
@@ -1500,6 +1467,9 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
 	if (cmd->sc_data_direction == DMA_FROM_DEVICE)
 		orb->request.misc |= cpu_to_be32(COMMAND_ORB_DIRECTION);
 
+	generation = device->generation;
+	smp_rmb();    /* sbp2_map_scatterlist looks at tgt->address_high */
+
 	if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0)
 		goto out;
 
@@ -1512,7 +1482,7 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
 	if (dma_mapping_error(device->card->device, orb->base.request_bus))
 		goto out;
 
-	sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, lu->generation,
+	sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, generation,
 		      lu->command_block_agent_address + SBP2_ORB_POINTER);
 	retval = 0;
  out:
@@ -1564,6 +1534,8 @@ static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
 	if (lu->tgt->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS)
 		blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512);
 
+	blk_queue_max_segment_size(sdev->request_queue, SBP2_MAX_SEG_SIZE);
+
 	return 0;
 }
 

drivers/firewire/fw-transaction.c

@@ -247,7 +247,7 @@ fw_fill_request(struct fw_packet *packet, int tcode, int tlabel,
  */
 void
 fw_send_request(struct fw_card *card, struct fw_transaction *t,
-		int tcode, int node_id, int generation, int speed,
+		int tcode, int destination_id, int generation, int speed,
 		unsigned long long offset,
 		void *payload, size_t length,
 		fw_transaction_callback_t callback, void *callback_data)
@@ -279,13 +279,14 @@ fw_send_request(struct fw_card *card, struct fw_transaction *t,
 	card->current_tlabel = (card->current_tlabel + 1) & 0x1f;
 	card->tlabel_mask |= (1 << tlabel);
 
-	t->node_id = node_id;
+	t->node_id = destination_id;
 	t->tlabel = tlabel;
 	t->callback = callback;
 	t->callback_data = callback_data;
 
-	fw_fill_request(&t->packet, tcode, t->tlabel, node_id, card->node_id,
-			generation, speed, offset, payload, length);
+	fw_fill_request(&t->packet, tcode, t->tlabel,
+			destination_id, card->node_id, generation,
+			speed, offset, payload, length);
 	t->packet.callback = transmit_complete_callback;
 
 	list_add_tail(&t->link, &card->transaction_list);
@@ -296,6 +297,45 @@ fw_send_request(struct fw_card *card, struct fw_transaction *t,
 }
 EXPORT_SYMBOL(fw_send_request);
 
+struct transaction_callback_data {
+	struct completion done;
+	void *payload;
+	int rcode;
+};
+
+static void transaction_callback(struct fw_card *card, int rcode,
+				 void *payload, size_t length, void *data)
+{
+	struct transaction_callback_data *d = data;
+
+	if (rcode == RCODE_COMPLETE)
+		memcpy(d->payload, payload, length);
+	d->rcode = rcode;
+	complete(&d->done);
+}
+
+/**
+ * fw_run_transaction - send request and sleep until transaction is completed
+ *
+ * Returns the RCODE.
+ */
+int fw_run_transaction(struct fw_card *card, int tcode, int destination_id,
+		int generation, int speed, unsigned long long offset,
+		void *data, size_t length)
+{
+	struct transaction_callback_data d;
+	struct fw_transaction t;
+
+	init_completion(&d.done);
+	d.payload = data;
+	fw_send_request(card, &t, tcode, destination_id, generation, speed,
+			offset, data, length, transaction_callback, &d);
+	wait_for_completion(&d.done);
+
+	return d.rcode;
+}
+EXPORT_SYMBOL(fw_run_transaction);
+
 static DEFINE_MUTEX(phy_config_mutex);
 static DECLARE_COMPLETION(phy_config_done);
 

drivers/firewire/fw-transaction.h

@@ -426,11 +426,14 @@ fw_core_initiate_bus_reset(struct fw_card *card, int short_reset);
 
 void
 fw_send_request(struct fw_card *card, struct fw_transaction *t,
-		int tcode, int node_id, int generation, int speed,
-		unsigned long long offset,
-		void *data, size_t length,
+		int tcode, int destination_id, int generation, int speed,
+		unsigned long long offset, void *data, size_t length,
 		fw_transaction_callback_t callback, void *callback_data);
 
+int fw_run_transaction(struct fw_card *card, int tcode, int destination_id,
+		       int generation, int speed, unsigned long long offset,
+		       void *data, size_t length);
+
 int fw_cancel_transaction(struct fw_card *card,
 			  struct fw_transaction *transaction);
 

drivers/ieee1394/csr1212.c

@@ -84,7 +84,7 @@ static const u8 csr1212_key_id_type_map[0x30] = {
 
 
 #define quads_to_bytes(_q) ((_q) * sizeof(u32))
-#define bytes_to_quads(_b) (((_b) + sizeof(u32) - 1) / sizeof(u32))
+#define bytes_to_quads(_b) DIV_ROUND_UP(_b, sizeof(u32))
 
 static void free_keyval(struct csr1212_keyval *kv)
 {

drivers/ieee1394/dv1394.c

@@ -918,7 +918,7 @@ static int do_dv1394_init(struct video_card *video, struct dv1394_init *init)
 		/* default SYT offset is 3 cycles */
 		init->syt_offset = 3;
 
-	if ( (init->channel > 63) || (init->channel < 0) )
+	if (init->channel > 63)
 		init->channel = 63;
 
 	chan_mask = (u64)1 << init->channel;

drivers/ieee1394/eth1394.c

@@ -1361,7 +1361,7 @@ static unsigned int ether1394_encapsulate_prep(unsigned int max_payload,
 		hdr->ff.dgl = dgl;
 		adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_FF];
 	}
-	return (dg_size + adj_max_payload - 1) / adj_max_payload;
+	return DIV_ROUND_UP(dg_size, adj_max_payload);
 }
 
 static unsigned int ether1394_encapsulate(struct sk_buff *skb,

drivers/ieee1394/nodemgr.c

@@ -154,9 +154,6 @@ struct host_info {
 
 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env);
-static void nodemgr_resume_ne(struct node_entry *ne);
-static void nodemgr_remove_ne(struct node_entry *ne);
-static struct node_entry *find_entry_by_guid(u64 guid);
 
 struct bus_type ieee1394_bus_type = {
 	.name		= "ieee1394",
@@ -385,27 +382,6 @@ static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute
 static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
 
 
-static ssize_t fw_set_destroy_node(struct bus_type *bus, const char *buf, size_t count)
-{
-	struct node_entry *ne;
-	u64 guid = (u64)simple_strtoull(buf, NULL, 16);
-
-	ne = find_entry_by_guid(guid);
-
-	if (ne == NULL || !ne->in_limbo)
-		return -EINVAL;
-
-	nodemgr_remove_ne(ne);
-
-	return count;
-}
-static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf)
-{
-	return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n");
-}
-static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node);
-
-
 static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
 			     size_t count)
 {
@@ -442,7 +418,6 @@ static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set
 
 
 struct bus_attribute *const fw_bus_attrs[] = {
-	&bus_attr_destroy_node,
 	&bus_attr_rescan,
 	&bus_attr_ignore_drivers,
 	NULL
@@ -734,10 +709,10 @@ static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
 
 static DEFINE_MUTEX(nodemgr_serialize_remove_uds);
 
-static int __match_ne(struct device *dev, void *data)
+static int match_ne(struct device *dev, void *data)
 {
 	struct unit_directory *ud;
-	struct node_entry *ne = (struct node_entry *)data;
+	struct node_entry *ne = data;
 
 	ud = container_of(dev, struct unit_directory, unit_dev);
 	return ud->ne == ne;
@@ -754,8 +729,7 @@ static void nodemgr_remove_uds(struct node_entry *ne)
 	 */
 	mutex_lock(&nodemgr_serialize_remove_uds);
 	for (;;) {
-		dev = class_find_device(&nodemgr_ud_class, NULL, ne,
-					__match_ne);
+		dev = class_find_device(&nodemgr_ud_class, NULL, ne, match_ne);
 		if (!dev)
 			break;
 		ud = container_of(dev, struct unit_directory, unit_dev);
@@ -785,7 +759,7 @@ static void nodemgr_remove_ne(struct node_entry *ne)
 	put_device(dev);
 }
 
-static int __nodemgr_remove_host_dev(struct device *dev, void *data)
+static int remove_host_dev(struct device *dev, void *data)
 {
 	if (dev->bus == &ieee1394_bus_type)
 		nodemgr_remove_ne(container_of(dev, struct node_entry,
@@ -795,7 +769,7 @@ static int __nodemgr_remove_host_dev(struct device *dev, void *data)
 
 static void nodemgr_remove_host_dev(struct device *dev)
 {
-	WARN_ON(device_for_each_child(dev, NULL, __nodemgr_remove_host_dev));
+	device_for_each_child(dev, NULL, remove_host_dev);
 	sysfs_remove_link(&dev->kobj, "irm_id");
 	sysfs_remove_link(&dev->kobj, "busmgr_id");
 	sysfs_remove_link(&dev->kobj, "host_id");
@@ -830,11 +804,10 @@ static void nodemgr_update_bus_options(struct node_entry *ne)
 }
 
 
-static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
-					      struct host_info *hi, nodeid_t nodeid,
-					      unsigned int generation)
+static struct node_entry *nodemgr_create_node(octlet_t guid,
+				struct csr1212_csr *csr, struct hpsb_host *host,
+				nodeid_t nodeid, unsigned int generation)
 {
-	struct hpsb_host *host = hi->host;
 	struct node_entry *ne;
 
 	ne = kzalloc(sizeof(*ne), GFP_KERNEL);
@@ -888,10 +861,10 @@ static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr
 	return NULL;
 }
 
-static int __match_ne_guid(struct device *dev, void *data)
+static int match_ne_guid(struct device *dev, void *data)
 {
 	struct node_entry *ne;
-	u64 *guid = (u64 *)data;
+	u64 *guid = data;
 
 	ne = container_of(dev, struct node_entry, node_dev);
 	return ne->guid == *guid;
@@ -902,8 +875,7 @@ static struct node_entry *find_entry_by_guid(u64 guid)
 	struct device *dev;
 	struct node_entry *ne;
 
-	dev = class_find_device(&nodemgr_ne_class, NULL, &guid,
-				__match_ne_guid);
+	dev = class_find_device(&nodemgr_ne_class, NULL, &guid, match_ne_guid);
 	if (!dev)
 		return NULL;
 	ne = container_of(dev, struct node_entry, node_dev);
@@ -912,21 +884,21 @@ static struct node_entry *find_entry_by_guid(u64 guid)
 	return ne;
 }
 
-struct match_nodeid_param {
+struct match_nodeid_parameter {
 	struct hpsb_host *host;
 	nodeid_t nodeid;
 };
 
-static int __match_ne_nodeid(struct device *dev, void *data)
+static int match_ne_nodeid(struct device *dev, void *data)
 {
 	int found = 0;
 	struct node_entry *ne;
-	struct match_nodeid_param *param = (struct match_nodeid_param *)data;
+	struct match_nodeid_parameter *p = data;
 
 	if (!dev)
 		goto ret;
 	ne = container_of(dev, struct node_entry, node_dev);
-	if (ne->host == param->host && ne->nodeid == param->nodeid)
+	if (ne->host == p->host && ne->nodeid == p->nodeid)
 		found = 1;
 ret:
 	return found;
@@ -937,13 +909,12 @@ static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 {
 	struct device *dev;
 	struct node_entry *ne;
-	struct match_nodeid_param param;
+	struct match_nodeid_parameter p;
 
-	param.host = host;
-	param.nodeid = nodeid;
+	p.host = host;
+	p.nodeid = nodeid;
 
-	dev = class_find_device(&nodemgr_ne_class, NULL, &param,
-				__match_ne_nodeid);
+	dev = class_find_device(&nodemgr_ne_class, NULL, &p, match_ne_nodeid);
 	if (!dev)
 		return NULL;
 	ne = container_of(dev, struct node_entry, node_dev);
@@ -990,7 +961,7 @@ static void nodemgr_register_device(struct node_entry *ne,
  * immediate unit directories looking for software_id and
  * software_version entries, in order to get driver autoloading working. */
 static struct unit_directory *nodemgr_process_unit_directory
-	(struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
+	(struct node_entry *ne, struct csr1212_keyval *ud_kv,
 	 unsigned int *id, struct unit_directory *parent)
 {
 	struct unit_directory *ud;
@@ -1083,7 +1054,7 @@ static struct unit_directory *nodemgr_process_unit_directory
 					nodemgr_register_device(ne, ud, &ne->device);
 				
 				/* process the child unit */
-				ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
+				ud_child = nodemgr_process_unit_directory(ne, kv, id, ud);
 
 				if (ud_child == NULL)
 					break;
@@ -1137,7 +1108,7 @@ static struct unit_directory *nodemgr_process_unit_directory
 }
 
 
-static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
+static void nodemgr_process_root_directory(struct node_entry *ne)
 {
 	unsigned int ud_id = 0;
 	struct csr1212_dentry *dentry;
@@ -1157,7 +1128,7 @@ static void nodemgr_process_root_directory(struct host_info *hi, struct node_ent
 			break;
 
 		case CSR1212_KV_ID_UNIT:
-			nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
+			nodemgr_process_unit_directory(ne, kv, &ud_id, NULL);
 			break;
 
 		case CSR1212_KV_ID_DESCRIPTOR:
@@ -1273,8 +1244,7 @@ void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
  * the to take whatever actions required.
  */
 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
-				struct host_info *hi, nodeid_t nodeid,
-				unsigned int generation)
+				nodeid_t nodeid, unsigned int generation)
 {
 	if (ne->nodeid != nodeid) {
 		HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
@@ -1305,19 +1275,23 @@ static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
 		csr1212_destroy_csr(csr);
 	}
 
-	if (ne->in_limbo)
-		nodemgr_resume_ne(ne);
-
 	/* Mark the node current */
 	ne->generation = generation;
-}
 
+	if (ne->in_limbo) {
+		device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
+		ne->in_limbo = false;
 
+		HPSB_DEBUG("Node reactivated: "
+			   "ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
+			   NODE_BUS_ARGS(ne->host, ne->nodeid),
+			   (unsigned long long)ne->guid);
+	}
+}
 
-static void nodemgr_node_scan_one(struct host_info *hi,
+static void nodemgr_node_scan_one(struct hpsb_host *host,
 				  nodeid_t nodeid, int generation)
 {
-	struct hpsb_host *host = hi->host;
 	struct node_entry *ne;
 	octlet_t guid;
 	struct csr1212_csr *csr;
@@ -1373,16 +1347,15 @@ static void nodemgr_node_scan_one(struct host_info *hi,
 	}
 
 	if (!ne)
-		nodemgr_create_node(guid, csr, hi, nodeid, generation);
+		nodemgr_create_node(guid, csr, host, nodeid, generation);
 	else
-		nodemgr_update_node(ne, csr, hi, nodeid, generation);
+		nodemgr_update_node(ne, csr, nodeid, generation);
 }
 
 
-static void nodemgr_node_scan(struct host_info *hi, int generation)
+static void nodemgr_node_scan(struct hpsb_host *host, int generation)
 {
 	int count;
-	struct hpsb_host *host = hi->host;
 	struct selfid *sid = (struct selfid *)host->topology_map;
 	nodeid_t nodeid = LOCAL_BUS;
 
@@ -1395,89 +1368,26 @@ static void nodemgr_node_scan(struct host_info *hi, int generation)
 			nodeid++;
 			continue;
 		}
-		nodemgr_node_scan_one(hi, nodeid++, generation);
-	}
-}
-
-static int __nodemgr_driver_suspend(struct device *dev, void *data)
-{
-	struct unit_directory *ud;
-	struct device_driver *drv;
-	struct node_entry *ne = (struct node_entry *)data;
-	int error;
-
-	ud = container_of(dev, struct unit_directory, unit_dev);
-	if (ud->ne == ne) {
-		drv = get_driver(ud->device.driver);
-		if (drv) {
-			error = 1; /* release if suspend is not implemented */
-			if (drv->suspend) {
-				down(&ud->device.sem);
-				error = drv->suspend(&ud->device, PMSG_SUSPEND);
-				up(&ud->device.sem);
-			}
-			if (error)
-				device_release_driver(&ud->device);
-			put_driver(drv);
-		}
-	}
-
-	return 0;
-}
-
-static int __nodemgr_driver_resume(struct device *dev, void *data)
-{
-	struct unit_directory *ud;
-	struct device_driver *drv;
-	struct node_entry *ne = (struct node_entry *)data;
-
-	ud = container_of(dev, struct unit_directory, unit_dev);
-	if (ud->ne == ne) {
-		drv = get_driver(ud->device.driver);
-		if (drv) {
-			if (drv->resume) {
-				down(&ud->device.sem);
-				drv->resume(&ud->device);
-				up(&ud->device.sem);
-			}
-			put_driver(drv);
-		}
+		nodemgr_node_scan_one(host, nodeid++, generation);
 	}
-
-	return 0;
 }
 
-static void nodemgr_suspend_ne(struct node_entry *ne)
+static void nodemgr_pause_ne(struct node_entry *ne)
 {
-	HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
+	HPSB_DEBUG("Node paused: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 		   NODE_BUS_ARGS(ne->host, ne->nodeid),
 		   (unsigned long long)ne->guid);
 
-	ne->in_limbo = 1;
+	ne->in_limbo = true;
 	WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
-
-	class_for_each_device(&nodemgr_ud_class, NULL, ne,
-			      __nodemgr_driver_suspend);
 }
 
-
-static void nodemgr_resume_ne(struct node_entry *ne)
-{
-	ne->in_limbo = 0;
-	device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
-
-	class_for_each_device(&nodemgr_ud_class, NULL, ne,
-			      __nodemgr_driver_resume);
-	HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
-		   NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
-}
-
-static int __nodemgr_update_pdrv(struct device *dev, void *data)
+static int update_pdrv(struct device *dev, void *data)
 {
 	struct unit_directory *ud;
 	struct device_driver *drv;
 	struct hpsb_protocol_driver *pdrv;
-	struct node_entry *ne = (struct node_entry *)data;
+	struct node_entry *ne = data;
 	int error;
 
 	ud = container_of(dev, struct unit_directory, unit_dev);
@@ -1503,11 +1413,9 @@ static int __nodemgr_update_pdrv(struct device *dev, void *data)
 
 static void nodemgr_update_pdrv(struct node_entry *ne)
 {
-	class_for_each_device(&nodemgr_ud_class, NULL, ne,
-			      __nodemgr_update_pdrv);
+	class_for_each_device(&nodemgr_ud_class, NULL, ne, update_pdrv);
 }
 
-
 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
  * seems like an optional service but in the end it is practically mandatory
  * as a consequence of these clauses.
@@ -1535,11 +1443,12 @@ static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
 }
 
 
-static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
+static void nodemgr_probe_ne(struct hpsb_host *host, struct node_entry *ne,
+			     int generation)
 {
 	struct device *dev;
 
-	if (ne->host != hi->host || ne->in_limbo)
+	if (ne->host != host || ne->in_limbo)
 		return;
 
 	dev = get_device(&ne->device);
@@ -1554,40 +1463,40 @@ static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int ge
 	 * down to the drivers. Otherwise, this is a dead node and we
 	 * suspend it. */
 	if (ne->needs_probe)
-		nodemgr_process_root_directory(hi, ne);
+		nodemgr_process_root_directory(ne);
 	else if (ne->generation == generation)
 		nodemgr_update_pdrv(ne);
 	else
-		nodemgr_suspend_ne(ne);
+		nodemgr_pause_ne(ne);
 
 	put_device(dev);
 }
 
-struct probe_param {
-	struct host_info *hi;
+struct node_probe_parameter {
+	struct hpsb_host *host;
 	int generation;
 	bool probe_now;
 };
 
 static int node_probe(struct device *dev, void *data)
 {
-	struct probe_param *p = data;
+	struct node_probe_parameter *p = data;
 	struct node_entry *ne;
 
-	if (p->generation != get_hpsb_generation(p->hi->host))
+	if (p->generation != get_hpsb_generation(p->host))
 		return -EAGAIN;
 
 	ne = container_of(dev, struct node_entry, node_dev);
 	if (ne->needs_probe == p->probe_now)
-		nodemgr_probe_ne(p->hi, ne, p->generation);
+		nodemgr_probe_ne(p->host, ne, p->generation);
 	return 0;
 }
 
-static void nodemgr_node_probe(struct host_info *hi, int generation)
+static int nodemgr_node_probe(struct hpsb_host *host, int generation)
 {
-	struct probe_param p;
+	struct node_probe_parameter p;
 
-	p.hi = hi;
+	p.host = host;
 	p.generation = generation;
 	/*
 	 * Do some processing of the nodes we've probed. This pulls them
@@ -1604,11 +1513,11 @@ static void nodemgr_node_probe(struct host_info *hi, int generation)
 	 */
 	p.probe_now = false;
 	if (class_for_each_device(&nodemgr_ne_class, NULL, &p, node_probe) != 0)
-		return;
+		return 0;
 
 	p.probe_now = true;
 	if (class_for_each_device(&nodemgr_ne_class, NULL, &p, node_probe) != 0)
-		return;
+		return 0;
 	/*
 	 * Now let's tell the bus to rescan our devices. This may seem
 	 * like overhead, but the driver-model core will only scan a
@@ -1620,6 +1529,27 @@ static void nodemgr_node_probe(struct host_info *hi, int generation)
 	 */
 	if (bus_rescan_devices(&ieee1394_bus_type) != 0)
 		HPSB_DEBUG("bus_rescan_devices had an error");
+
+	return 1;
+}
+
+static int remove_nodes_in_limbo(struct device *dev, void *data)
+{
+	struct node_entry *ne;
+
+	if (dev->bus != &ieee1394_bus_type)
+		return 0;
+
+	ne = container_of(dev, struct node_entry, device);
+	if (ne->in_limbo)
+		nodemgr_remove_ne(ne);
+
+	return 0;
+}
+
+static void nodemgr_remove_nodes_in_limbo(struct hpsb_host *host)
+{
+	device_for_each_child(&host->device, NULL, remove_nodes_in_limbo);
 }
 
 static int nodemgr_send_resume_packet(struct hpsb_host *host)
@@ -1730,10 +1660,9 @@ static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
 	return 1;
 }
 
-static int nodemgr_host_thread(void *__hi)
+static int nodemgr_host_thread(void *data)
 {
-	struct host_info *hi = (struct host_info *)__hi;
-	struct hpsb_host *host = hi->host;
+	struct hpsb_host *host = data;
 	unsigned int g, generation = 0;
 	int i, reset_cycles = 0;
 
@@ -1787,36 +1716,48 @@ static int nodemgr_host_thread(void *__hi)
 		 * entries. This does not do the sysfs stuff, since that
 		 * would trigger uevents and such, which is a bad idea at
 		 * this point. */
-		nodemgr_node_scan(hi, generation);
+		nodemgr_node_scan(host, generation);
 
 		/* This actually does the full probe, with sysfs
 		 * registration. */
-		nodemgr_node_probe(hi, generation);
+		if (!nodemgr_node_probe(host, generation))
+			continue;
 
 		/* Update some of our sysfs symlinks */
 		nodemgr_update_host_dev_links(host);
+
+		/* Sleep 3 seconds */
+		for (i = 3000/200; i; i--) {
+			msleep_interruptible(200);
+			if (kthread_should_stop())
+				goto exit;
+
+			if (generation != get_hpsb_generation(host))
+				break;
+		}
+		/* Remove nodes which are gone, unless a bus reset happened */
+		if (!i)
+			nodemgr_remove_nodes_in_limbo(host);
 	}
 exit:
 	HPSB_VERBOSE("NodeMgr: Exiting thread");
 	return 0;
 }
 
-struct host_iter_param {
+struct per_host_parameter {
 	void *data;
 	int (*cb)(struct hpsb_host *, void *);
 };
 
-static int __nodemgr_for_each_host(struct device *dev, void *data)
+static int per_host(struct device *dev, void *data)
 {
 	struct hpsb_host *host;
-	struct host_iter_param *hip = (struct host_iter_param *)data;
-	int error = 0;
+	struct per_host_parameter *p = data;
 
 	host = container_of(dev, struct hpsb_host, host_dev);
-	error = hip->cb(host, hip->data);
-
-	return error;
+	return p->cb(host, p->data);
 }
+
 /**
  * nodemgr_for_each_host - call a function for each IEEE 1394 host
  * @data: an address to supply to the callback
@@ -1831,15 +1772,11 @@ static int __nodemgr_for_each_host(struct device *dev, void *data)
  */
 int nodemgr_for_each_host(void *data, int (*cb)(struct hpsb_host *, void *))
 {
-	struct host_iter_param hip;
-	int error;
-
-	hip.cb = cb;
-	hip.data = data;
-	error = class_for_each_device(&hpsb_host_class, NULL, &hip,
-				      __nodemgr_for_each_host);
+	struct per_host_parameter p;
 
-	return error;
+	p.cb = cb;
+	p.data = data;
+	return class_for_each_device(&hpsb_host_class, NULL, &p, per_host);
 }
 
 /* The following two convenience functions use a struct node_entry
@@ -1893,7 +1830,7 @@ static void nodemgr_add_host(struct hpsb_host *host)
 		return;
 	}
 	hi->host = host;
-	hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
+	hi->thread = kthread_run(nodemgr_host_thread, host, "knodemgrd_%d",
 				 host->id);
 	if (IS_ERR(hi->thread)) {
 		HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);

drivers/ieee1394/nodemgr.h

@@ -110,7 +110,7 @@ struct node_entry {
 	struct device node_dev;
 
 	/* Means this node is not attached anymore */
-	int in_limbo;
+	bool in_limbo;
 
 	struct csr1212_csr *csr;
 };

drivers/ieee1394/raw1394-private.h

@@ -22,6 +22,7 @@ enum raw1394_iso_state { RAW1394_ISO_INACTIVE = 0,
 struct file_info {
         struct list_head list;
 
+	struct mutex state_mutex;
         enum { opened, initialized, connected } state;
         unsigned int protocol_version;
 

drivers/ieee1394/raw1394.c

@@ -34,6 +34,7 @@
 #include <linux/fs.h>
 #include <linux/poll.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/vmalloc.h>
@@ -2267,6 +2268,8 @@ static ssize_t raw1394_write(struct file *file, const char __user * buffer,
 		return -EFAULT;
 	}
 
+	mutex_lock(&fi->state_mutex);
+
 	switch (fi->state) {
 	case opened:
 		retval = state_opened(fi, req);
@@ -2281,6 +2284,8 @@ static ssize_t raw1394_write(struct file *file, const char __user * buffer,
 		break;
 	}
 
+	mutex_unlock(&fi->state_mutex);
+
 	if (retval < 0) {
 		free_pending_request(req);
 	} else {
@@ -2541,59 +2546,60 @@ static int raw1394_read_cycle_timer(struct file_info *fi, void __user * uaddr)
 static int raw1394_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	struct file_info *fi = file->private_data;
+	int ret;
+
+	mutex_lock(&fi->state_mutex);
 
 	if (fi->iso_state == RAW1394_ISO_INACTIVE)
-		return -EINVAL;
+		ret = -EINVAL;
+	else
+		ret = dma_region_mmap(&fi->iso_handle->data_buf, file, vma);
 
-	return dma_region_mmap(&fi->iso_handle->data_buf, file, vma);
+	mutex_unlock(&fi->state_mutex);
+
+	return ret;
 }
 
-/* ioctl is only used for rawiso operations */
-static long do_raw1394_ioctl(struct file *file, unsigned int cmd,
-							unsigned long arg)
+static long raw1394_ioctl_inactive(struct file_info *fi, unsigned int cmd,
+				   void __user *argp)
 {
-	struct file_info *fi = file->private_data;
-	void __user *argp = (void __user *)arg;
-
-	switch (fi->iso_state) {
-	case RAW1394_ISO_INACTIVE:
 	switch (cmd) {
 	case RAW1394_IOC_ISO_XMIT_INIT:
 		return raw1394_iso_xmit_init(fi, argp);
 	case RAW1394_IOC_ISO_RECV_INIT:
 		return raw1394_iso_recv_init(fi, argp);
 	default:
-			break;
+		return -EINVAL;
 	}
-		break;
-	case RAW1394_ISO_RECV:
+}
+
+static long raw1394_ioctl_recv(struct file_info *fi, unsigned int cmd,
+			       unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+
 	switch (cmd) {
 	case RAW1394_IOC_ISO_RECV_START:{
-				/* copy args from user-space */
 			int args[3];
-				if (copy_from_user
-				    (&args[0], argp, sizeof(args)))
+
+			if (copy_from_user(&args[0], argp, sizeof(args)))
 				return -EFAULT;
 			return hpsb_iso_recv_start(fi->iso_handle,
-							   args[0], args[1],
-							   args[2]);
+						   args[0], args[1], args[2]);
 		}
 	case RAW1394_IOC_ISO_XMIT_RECV_STOP:
 		hpsb_iso_stop(fi->iso_handle);
 		return 0;
 	case RAW1394_IOC_ISO_RECV_LISTEN_CHANNEL:
-			return hpsb_iso_recv_listen_channel(fi->iso_handle,
-							    arg);
+		return hpsb_iso_recv_listen_channel(fi->iso_handle, arg);
 	case RAW1394_IOC_ISO_RECV_UNLISTEN_CHANNEL:
-			return hpsb_iso_recv_unlisten_channel(fi->iso_handle,
-							      arg);
+		return hpsb_iso_recv_unlisten_channel(fi->iso_handle, arg);
 	case RAW1394_IOC_ISO_RECV_SET_CHANNEL_MASK:{
-				/* copy the u64 from user-space */
 			u64 mask;
+
 			if (copy_from_user(&mask, argp, sizeof(mask)))
 				return -EFAULT;
-				return hpsb_iso_recv_set_channel_mask(fi->
-								      iso_handle,
+			return hpsb_iso_recv_set_channel_mask(fi->iso_handle,
 							      mask);
 		}
 	case RAW1394_IOC_ISO_GET_STATUS:
@@ -2601,8 +2607,7 @@ static long do_raw1394_ioctl(struct file *file, unsigned int cmd,
 	case RAW1394_IOC_ISO_RECV_PACKETS:
 		return raw1394_iso_recv_packets(fi, argp);
 	case RAW1394_IOC_ISO_RECV_RELEASE_PACKETS:
-			return hpsb_iso_recv_release_packets(fi->iso_handle,
-							     arg);
+		return hpsb_iso_recv_release_packets(fi->iso_handle, arg);
 	case RAW1394_IOC_ISO_RECV_FLUSH:
 		return hpsb_iso_recv_flush(fi->iso_handle);
 	case RAW1394_IOC_ISO_SHUTDOWN:
@@ -2611,15 +2616,19 @@ static long do_raw1394_ioctl(struct file *file, unsigned int cmd,
 	case RAW1394_IOC_ISO_QUEUE_ACTIVITY:
 		queue_rawiso_event(fi);
 		return 0;
+	default:
+		return -EINVAL;
 	}
-		break;
-	case RAW1394_ISO_XMIT:
+}
+
+static long raw1394_ioctl_xmit(struct file_info *fi, unsigned int cmd,
+			       void __user *argp)
+{
 	switch (cmd) {
 	case RAW1394_IOC_ISO_XMIT_START:{
-				/* copy two ints from user-space */
 			int args[2];
-				if (copy_from_user
-				    (&args[0], argp, sizeof(args)))
+
+			if (copy_from_user(&args[0], argp, sizeof(args)))
 				return -EFAULT;
 			return hpsb_iso_xmit_start(fi->iso_handle,
 						   args[0], args[1]);
@@ -2639,11 +2648,18 @@ static long do_raw1394_ioctl(struct file *file, unsigned int cmd,
 	case RAW1394_IOC_ISO_QUEUE_ACTIVITY:
 		queue_rawiso_event(fi);
 		return 0;
-		}
-		break;
 	default:
-		break;
+		return -EINVAL;
 	}
+}
+
+/* ioctl is only used for rawiso operations */
+static long raw1394_ioctl(struct file *file, unsigned int cmd,
+			  unsigned long arg)
+{
+	struct file_info *fi = file->private_data;
+	void __user *argp = (void __user *)arg;
+	long ret;
 
 	/* state-independent commands */
 	switch(cmd) {
@@ -2653,16 +2669,25 @@ static long do_raw1394_ioctl(struct file *file, unsigned int cmd,
 		break;
 	}
 
-	return -EINVAL;
-}
+	mutex_lock(&fi->state_mutex);
+
+	switch (fi->iso_state) {
+	case RAW1394_ISO_INACTIVE:
+		ret = raw1394_ioctl_inactive(fi, cmd, argp);
+		break;
+	case RAW1394_ISO_RECV:
+		ret = raw1394_ioctl_recv(fi, cmd, arg);
+		break;
+	case RAW1394_ISO_XMIT:
+		ret = raw1394_ioctl_xmit(fi, cmd, argp);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	mutex_unlock(&fi->state_mutex);
 
-static long raw1394_ioctl(struct file *file, unsigned int cmd,
-							unsigned long arg)
-{
-	long ret;
-	lock_kernel();
-	ret = do_raw1394_ioctl(file, cmd, arg);
-	unlock_kernel();
 	return ret;
 }
 
@@ -2700,7 +2725,7 @@ static long raw1394_iso_xmit_recv_packets32(struct file *file, unsigned int cmd,
 	    !copy_from_user(&infos32, &arg->infos, sizeof infos32)) {
 		infos = compat_ptr(infos32);
 		if (!copy_to_user(&dst->infos, &infos, sizeof infos))
-			err = do_raw1394_ioctl(file, cmd, (unsigned long)dst);
+			err = raw1394_ioctl(file, cmd, (unsigned long)dst);
 	}
 	return err;
 }
@@ -2724,7 +2749,6 @@ static long raw1394_compat_ioctl(struct file *file,
 	void __user *argp = (void __user *)arg;
 	long err;
 
-	lock_kernel();
 	switch (cmd) {
 	/* These requests have same format as long as 'int' has same size. */
 	case RAW1394_IOC_ISO_RECV_INIT:
@@ -2741,7 +2765,7 @@ static long raw1394_compat_ioctl(struct file *file,
 	case RAW1394_IOC_ISO_GET_STATUS:
 	case RAW1394_IOC_ISO_SHUTDOWN:
 	case RAW1394_IOC_ISO_QUEUE_ACTIVITY:
-		err = do_raw1394_ioctl(file, cmd, arg);
+		err = raw1394_ioctl(file, cmd, arg);
 		break;
 	/* These request have different format. */
 	case RAW1394_IOC_ISO_RECV_PACKETS32:
@@ -2757,7 +2781,6 @@ static long raw1394_compat_ioctl(struct file *file,
 		err = -EINVAL;
 		break;
 	}
-	unlock_kernel();
 
 	return err;
 }
@@ -2791,6 +2814,7 @@ static int raw1394_open(struct inode *inode, struct file *file)
 	fi->notification = (u8) RAW1394_NOTIFY_ON;	/* busreset notification */
 
 	INIT_LIST_HEAD(&fi->list);
+	mutex_init(&fi->state_mutex);
 	fi->state = opened;
 	INIT_LIST_HEAD(&fi->req_pending);
 	INIT_LIST_HEAD(&fi->req_complete);

drivers/ieee1394/sbp2.c

@@ -526,26 +526,41 @@ static void sbp2util_write_doorbell(struct work_struct *work)
 
 static int sbp2util_create_command_orb_pool(struct sbp2_lu *lu)
 {
-	struct sbp2_fwhost_info *hi = lu->hi;
 	struct sbp2_command_info *cmd;
+	struct device *dmadev = lu->hi->host->device.parent;
 	int i, orbs = sbp2_serialize_io ? 2 : SBP2_MAX_CMDS;
 
 	for (i = 0; i < orbs; i++) {
 		cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 		if (!cmd)
-			return -ENOMEM;
-		cmd->command_orb_dma = dma_map_single(hi->host->device.parent,
-						&cmd->command_orb,
+			goto failed_alloc;
+
+		cmd->command_orb_dma =
+		    dma_map_single(dmadev, &cmd->command_orb,
 				   sizeof(struct sbp2_command_orb),
 				   DMA_TO_DEVICE);
-		cmd->sge_dma = dma_map_single(hi->host->device.parent,
-					&cmd->scatter_gather_element,
+		if (dma_mapping_error(dmadev, cmd->command_orb_dma))
+			goto failed_orb;
+
+		cmd->sge_dma =
+		    dma_map_single(dmadev, &cmd->scatter_gather_element,
 				   sizeof(cmd->scatter_gather_element),
 				   DMA_TO_DEVICE);
+		if (dma_mapping_error(dmadev, cmd->sge_dma))
+			goto failed_sge;
+
 		INIT_LIST_HEAD(&cmd->list);
 		list_add_tail(&cmd->list, &lu->cmd_orb_completed);
 	}
 	return 0;
+
+failed_sge:
+	dma_unmap_single(dmadev, cmd->command_orb_dma,
+			 sizeof(struct sbp2_command_orb), DMA_TO_DEVICE);
+failed_orb:
+	kfree(cmd);
+failed_alloc:
+	return -ENOMEM;
 }
 
 static void sbp2util_remove_command_orb_pool(struct sbp2_lu *lu,
@@ -641,24 +656,11 @@ static struct sbp2_command_info *sbp2util_allocate_command_orb(
 static void sbp2util_mark_command_completed(struct sbp2_lu *lu,
 					    struct sbp2_command_info *cmd)
 {
-	struct hpsb_host *host = lu->ud->ne->host;
-
-	if (cmd->cmd_dma) {
-		if (cmd->dma_type == CMD_DMA_SINGLE)
-			dma_unmap_single(host->device.parent, cmd->cmd_dma,
-					 cmd->dma_size, cmd->dma_dir);
-		else if (cmd->dma_type == CMD_DMA_PAGE)
-			dma_unmap_page(host->device.parent, cmd->cmd_dma,
-				       cmd->dma_size, cmd->dma_dir);
-		/* XXX: Check for CMD_DMA_NONE bug */
-		cmd->dma_type = CMD_DMA_NONE;
-		cmd->cmd_dma = 0;
-	}
-	if (cmd->sge_buffer) {
-		dma_unmap_sg(host->device.parent, cmd->sge_buffer,
-			     cmd->dma_size, cmd->dma_dir);
-		cmd->sge_buffer = NULL;
-	}
+	if (scsi_sg_count(cmd->Current_SCpnt))
+		dma_unmap_sg(lu->ud->ne->host->device.parent,
+			     scsi_sglist(cmd->Current_SCpnt),
+			     scsi_sg_count(cmd->Current_SCpnt),
+			     cmd->Current_SCpnt->sc_data_direction);
 	list_move_tail(&cmd->list, &lu->cmd_orb_completed);
 }
 
@@ -823,6 +825,10 @@ static struct sbp2_lu *sbp2_alloc_device(struct unit_directory *ud)
 #endif
 	}
 
+	if (dma_get_max_seg_size(hi->host->device.parent) > SBP2_MAX_SEG_SIZE)
+		BUG_ON(dma_set_max_seg_size(hi->host->device.parent,
+					    SBP2_MAX_SEG_SIZE));
+
 	/* Prevent unloading of the 1394 host */
 	if (!try_module_get(hi->host->driver->owner)) {
 		SBP2_ERR("failed to get a reference on 1394 host driver");
@@ -1494,84 +1500,65 @@ static int sbp2_agent_reset(struct sbp2_lu *lu, int wait)
 	return 0;
 }
 
-static void sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb,
+static int sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb,
 				    struct sbp2_fwhost_info *hi,
 				    struct sbp2_command_info *cmd,
-				     unsigned int scsi_use_sg,
+				    unsigned int sg_count,
 				    struct scatterlist *sg,
 				    u32 orb_direction,
 				    enum dma_data_direction dma_dir)
 {
-	cmd->dma_dir = dma_dir;
+	struct device *dmadev = hi->host->device.parent;
+	struct sbp2_unrestricted_page_table *pt;
+	int i, n;
+
+	n = dma_map_sg(dmadev, sg, sg_count, dma_dir);
+	if (n == 0)
+		return -ENOMEM;
+
 	orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id);
 	orb->misc |= ORB_SET_DIRECTION(orb_direction);
 
 	/* special case if only one element (and less than 64KB in size) */
-	if (scsi_use_sg == 1 && sg->length <= SBP2_MAX_SG_ELEMENT_LENGTH) {
-
-		cmd->dma_size = sg->length;
-		cmd->dma_type = CMD_DMA_PAGE;
-		cmd->cmd_dma = dma_map_page(hi->host->device.parent,
-					    sg_page(sg), sg->offset,
-					    cmd->dma_size, cmd->dma_dir);
-
-		orb->data_descriptor_lo = cmd->cmd_dma;
-		orb->misc |= ORB_SET_DATA_SIZE(cmd->dma_size);
-
+	if (n == 1) {
+		orb->misc |= ORB_SET_DATA_SIZE(sg_dma_len(sg));
+		orb->data_descriptor_lo = sg_dma_address(sg);
 	} else {
-		struct sbp2_unrestricted_page_table *sg_element =
-						&cmd->scatter_gather_element[0];
-		u32 sg_count, sg_len;
-		dma_addr_t sg_addr;
-		int i, count = dma_map_sg(hi->host->device.parent, sg,
-					  scsi_use_sg, dma_dir);
-
-		cmd->dma_size = scsi_use_sg;
-		cmd->sge_buffer = sg;
-
-		/* use page tables (s/g) */
-		orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1);
-		orb->data_descriptor_lo = cmd->sge_dma;
+		pt = &cmd->scatter_gather_element[0];
 
-		/* loop through and fill out our SBP-2 page tables
-		 * (and split up anything too large) */
-		for (i = 0, sg_count = 0; i < count; i++, sg = sg_next(sg)) {
-			sg_len = sg_dma_len(sg);
-			sg_addr = sg_dma_address(sg);
-			while (sg_len) {
-				sg_element[sg_count].segment_base_lo = sg_addr;
-				if (sg_len > SBP2_MAX_SG_ELEMENT_LENGTH) {
-					sg_element[sg_count].length_segment_base_hi =
-						PAGE_TABLE_SET_SEGMENT_LENGTH(SBP2_MAX_SG_ELEMENT_LENGTH);
-					sg_addr += SBP2_MAX_SG_ELEMENT_LENGTH;
-					sg_len -= SBP2_MAX_SG_ELEMENT_LENGTH;
-				} else {
-					sg_element[sg_count].length_segment_base_hi =
-						PAGE_TABLE_SET_SEGMENT_LENGTH(sg_len);
-					sg_len = 0;
-				}
-				sg_count++;
-			}
+		dma_sync_single_for_cpu(dmadev, cmd->sge_dma,
+					sizeof(cmd->scatter_gather_element),
+					DMA_TO_DEVICE);
+
+		for_each_sg(sg, sg, n, i) {
+			pt[i].high = cpu_to_be32(sg_dma_len(sg) << 16);
+			pt[i].low = cpu_to_be32(sg_dma_address(sg));
 		}
 
-		orb->misc |= ORB_SET_DATA_SIZE(sg_count);
+		orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1) |
+			     ORB_SET_DATA_SIZE(n);
+		orb->data_descriptor_lo = cmd->sge_dma;
 
-		sbp2util_cpu_to_be32_buffer(sg_element,
-				(sizeof(struct sbp2_unrestricted_page_table)) *
-				sg_count);
+		dma_sync_single_for_device(dmadev, cmd->sge_dma,
+					   sizeof(cmd->scatter_gather_element),
+					   DMA_TO_DEVICE);
 	}
+	return 0;
 }
 
-static void sbp2_create_command_orb(struct sbp2_lu *lu,
+static int sbp2_create_command_orb(struct sbp2_lu *lu,
 				   struct sbp2_command_info *cmd,
 				   struct scsi_cmnd *SCpnt)
 {
-	struct sbp2_fwhost_info *hi = lu->hi;
+	struct device *dmadev = lu->hi->host->device.parent;
 	struct sbp2_command_orb *orb = &cmd->command_orb;
-	u32 orb_direction;
 	unsigned int scsi_request_bufflen = scsi_bufflen(SCpnt);
 	enum dma_data_direction dma_dir = SCpnt->sc_data_direction;
+	u32 orb_direction;
+	int ret;
 
+	dma_sync_single_for_cpu(dmadev, cmd->command_orb_dma,
+				sizeof(struct sbp2_command_orb), DMA_TO_DEVICE);
 	/*
 	 * Set-up our command ORB.
 	 *
@@ -1602,15 +1589,21 @@ static void sbp2_create_command_orb(struct sbp2_lu *lu,
 		orb->data_descriptor_hi = 0x0;
 		orb->data_descriptor_lo = 0x0;
 		orb->misc |= ORB_SET_DIRECTION(1);
-	} else
-		sbp2_prep_command_orb_sg(orb, hi, cmd, scsi_sg_count(SCpnt),
+		ret = 0;
+	} else {
+		ret = sbp2_prep_command_orb_sg(orb, lu->hi, cmd,
+					       scsi_sg_count(SCpnt),
 					       scsi_sglist(SCpnt),
 					       orb_direction, dma_dir);
-
+	}
 	sbp2util_cpu_to_be32_buffer(orb, sizeof(*orb));
 
 	memset(orb->cdb, 0, sizeof(orb->cdb));
 	memcpy(orb->cdb, SCpnt->cmnd, SCpnt->cmd_len);
+
+	dma_sync_single_for_device(dmadev, cmd->command_orb_dma,
+			sizeof(struct sbp2_command_orb), DMA_TO_DEVICE);
+	return ret;
 }
 
 static void sbp2_link_orb_command(struct sbp2_lu *lu,
@@ -1624,14 +1617,6 @@ static void sbp2_link_orb_command(struct sbp2_lu *lu,
 	size_t length;
 	unsigned long flags;
 
-	dma_sync_single_for_device(hi->host->device.parent,
-				   cmd->command_orb_dma,
-				   sizeof(struct sbp2_command_orb),
-				   DMA_TO_DEVICE);
-	dma_sync_single_for_device(hi->host->device.parent, cmd->sge_dma,
-				   sizeof(cmd->scatter_gather_element),
-				   DMA_TO_DEVICE);
-
 	/* check to see if there are any previous orbs to use */
 	spin_lock_irqsave(&lu->cmd_orb_lock, flags);
 	last_orb = lu->last_orb;
@@ -1699,9 +1684,10 @@ static int sbp2_send_command(struct sbp2_lu *lu, struct scsi_cmnd *SCpnt,
 	if (!cmd)
 		return -EIO;
 
-	sbp2_create_command_orb(lu, cmd, SCpnt);
-	sbp2_link_orb_command(lu, cmd);
+	if (sbp2_create_command_orb(lu, cmd, SCpnt))
+		return -ENOMEM;
 
+	sbp2_link_orb_command(lu, cmd);
 	return 0;
 }
 
@@ -1789,13 +1775,6 @@ static int sbp2_handle_status_write(struct hpsb_host *host, int nodeid,
 	else
 		cmd = sbp2util_find_command_for_orb(lu, sb->ORB_offset_lo);
 	if (cmd) {
-		dma_sync_single_for_cpu(hi->host->device.parent,
-					cmd->command_orb_dma,
-					sizeof(struct sbp2_command_orb),
-					DMA_TO_DEVICE);
-		dma_sync_single_for_cpu(hi->host->device.parent, cmd->sge_dma,
-					sizeof(cmd->scatter_gather_element),
-					DMA_TO_DEVICE);
 		/* Grab SCSI command pointers and check status. */
 		/*
 		 * FIXME: If the src field in the status is 1, the ORB DMA must
@@ -1912,7 +1891,6 @@ static int sbp2scsi_queuecommand(struct scsi_cmnd *SCpnt,
 
 static void sbp2scsi_complete_all_commands(struct sbp2_lu *lu, u32 status)
 {
-	struct sbp2_fwhost_info *hi = lu->hi;
 	struct list_head *lh;
 	struct sbp2_command_info *cmd;
 	unsigned long flags;
@@ -1921,13 +1899,6 @@ static void sbp2scsi_complete_all_commands(struct sbp2_lu *lu, u32 status)
 	while (!list_empty(&lu->cmd_orb_inuse)) {
 		lh = lu->cmd_orb_inuse.next;
 		cmd = list_entry(lh, struct sbp2_command_info, list);
-		dma_sync_single_for_cpu(hi->host->device.parent,
-				        cmd->command_orb_dma,
-					sizeof(struct sbp2_command_orb),
-					DMA_TO_DEVICE);
-		dma_sync_single_for_cpu(hi->host->device.parent, cmd->sge_dma,
-					sizeof(cmd->scatter_gather_element),
-					DMA_TO_DEVICE);
 		sbp2util_mark_command_completed(lu, cmd);
 		if (cmd->Current_SCpnt) {
 			cmd->Current_SCpnt->result = status << 16;
@@ -2033,6 +2004,8 @@ static int sbp2scsi_slave_configure(struct scsi_device *sdev)
 		sdev->start_stop_pwr_cond = 1;
 	if (lu->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS)
 		blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512);
+
+	blk_queue_max_segment_size(sdev->request_queue, SBP2_MAX_SEG_SIZE);
 	return 0;
 }
 
@@ -2049,7 +2022,6 @@ static void sbp2scsi_slave_destroy(struct scsi_device *sdev)
 static int sbp2scsi_abort(struct scsi_cmnd *SCpnt)
 {
 	struct sbp2_lu *lu = (struct sbp2_lu *)SCpnt->device->host->hostdata[0];
-	struct sbp2_fwhost_info *hi = lu->hi;
 	struct sbp2_command_info *cmd;
 	unsigned long flags;
 
@@ -2063,14 +2035,6 @@ static int sbp2scsi_abort(struct scsi_cmnd *SCpnt)
 		spin_lock_irqsave(&lu->cmd_orb_lock, flags);
 		cmd = sbp2util_find_command_for_SCpnt(lu, SCpnt);
 		if (cmd) {
-			dma_sync_single_for_cpu(hi->host->device.parent,
-					cmd->command_orb_dma,
-					sizeof(struct sbp2_command_orb),
-					DMA_TO_DEVICE);
-			dma_sync_single_for_cpu(hi->host->device.parent,
-					cmd->sge_dma,
-					sizeof(cmd->scatter_gather_element),
-					DMA_TO_DEVICE);
 			sbp2util_mark_command_completed(lu, cmd);
 			if (cmd->Current_SCpnt) {
 				cmd->Current_SCpnt->result = DID_ABORT << 16;

drivers/ieee1394/sbp2.h

@@ -139,13 +139,10 @@ struct sbp2_logout_orb {
 	u32 status_fifo_lo;
 } __attribute__((packed));
 
-#define PAGE_TABLE_SET_SEGMENT_BASE_HI(v)	((v) & 0xffff)
-#define PAGE_TABLE_SET_SEGMENT_LENGTH(v)	(((v) & 0xffff) << 16)
-
 struct sbp2_unrestricted_page_table {
-	u32 length_segment_base_hi;
-	u32 segment_base_lo;
-} __attribute__((packed));
+	__be32 high;
+	__be32 low;
+};
 
 #define RESP_STATUS_REQUEST_COMPLETE		0x0
 #define RESP_STATUS_TRANSPORT_FAILURE		0x1
@@ -216,15 +213,18 @@ struct sbp2_status_block {
 #define SBP2_UNIT_SPEC_ID_ENTRY			0x0000609e
 #define SBP2_SW_VERSION_ENTRY			0x00010483
 
-
 /*
- * SCSI specific definitions
+ * The default maximum s/g segment size of a FireWire controller is
+ * usually 0x10000, but SBP-2 only allows 0xffff. Since buffers have to
+ * be quadlet-aligned, we set the length limit to 0xffff & ~3.
  */
+#define SBP2_MAX_SEG_SIZE			0xfffc
 
-#define SBP2_MAX_SG_ELEMENT_LENGTH		0xf000
-/* There is no real limitation of the queue depth (i.e. length of the linked
+/*
+ * There is no real limitation of the queue depth (i.e. length of the linked
  * list of command ORBs) at the target. The chosen depth is merely an
- * implementation detail of the sbp2 driver. */
+ * implementation detail of the sbp2 driver.
+ */
 #define SBP2_MAX_CMDS				8
 
 #define SBP2_SCSI_STATUS_GOOD			0x0
@@ -240,12 +240,6 @@ struct sbp2_status_block {
  * Representations of commands and devices
  */
 
-enum sbp2_dma_types {
-	CMD_DMA_NONE,
-	CMD_DMA_PAGE,
-	CMD_DMA_SINGLE
-};
-
 /* Per SCSI command */
 struct sbp2_command_info {
 	struct list_head list;
@@ -258,11 +252,6 @@ struct sbp2_command_info {
 	struct sbp2_unrestricted_page_table
 		scatter_gather_element[SG_ALL] __attribute__((aligned(8)));
 	dma_addr_t sge_dma;
-	void *sge_buffer;
-	dma_addr_t cmd_dma;
-	enum sbp2_dma_types dma_type;
-	unsigned long dma_size;
-	enum dma_data_direction dma_dir;
 };
 
 /* Per FireWire host */

drivers/ieee1394/video1394.c

@@ -893,7 +893,7 @@ static long video1394_ioctl(struct file *file,
 		if (unlikely(d == NULL))
 			return -EFAULT;
 
-		if (unlikely((v.buffer<0) || (v.buffer>=d->num_desc - 1))) {
+		if (unlikely(v.buffer >= d->num_desc - 1)) {
 			PRINT(KERN_ERR, ohci->host->id,
 			      "Buffer %d out of range",v.buffer);
 			return -EINVAL;
@@ -959,7 +959,7 @@ static long video1394_ioctl(struct file *file,
 		if (unlikely(d == NULL))
 			return -EFAULT;
 
-		if (unlikely((v.buffer<0) || (v.buffer>d->num_desc - 1))) {
+		if (unlikely(v.buffer > d->num_desc - 1)) {
 			PRINT(KERN_ERR, ohci->host->id,
 			      "Buffer %d out of range",v.buffer);
 			return -EINVAL;
@@ -1030,7 +1030,7 @@ static long video1394_ioctl(struct file *file,
 		d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, v.channel);
 		if (d == NULL) return -EFAULT;
 
-		if ((v.buffer<0) || (v.buffer>=d->num_desc - 1)) {
+		if (v.buffer >= d->num_desc - 1) {
 			PRINT(KERN_ERR, ohci->host->id,
 			      "Buffer %d out of range",v.buffer);
 			return -EINVAL;
@@ -1137,7 +1137,7 @@ static long video1394_ioctl(struct file *file,
 		d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, v.channel);
 		if (d == NULL) return -EFAULT;
 
-		if ((v.buffer<0) || (v.buffer>=d->num_desc-1)) {
+		if (v.buffer >= d->num_desc - 1) {
 			PRINT(KERN_ERR, ohci->host->id,
 			      "Buffer %d out of range",v.buffer);
 			return -EINVAL;

include/linux/firewire-cdev.h

@@ -154,8 +154,13 @@ struct fw_cdev_event_iso_interrupt {
  * @request:       Valid if @common.type == %FW_CDEV_EVENT_REQUEST
  * @iso_interrupt: Valid if @common.type == %FW_CDEV_EVENT_ISO_INTERRUPT
  *
- * Convenience union for userspace use.  Events could be read(2) into a char
- * buffer and then cast to this union for further processing.
+ * Convenience union for userspace use.  Events could be read(2) into an
+ * appropriately aligned char buffer and then cast to this union for further
+ * processing.  Note that for a request, response or iso_interrupt event,
+ * the data[] or header[] may make the size of the full event larger than
+ * sizeof(union fw_cdev_event).  Also note that if you attempt to read(2)
+ * an event into a buffer that is not large enough for it, the data that does
+ * not fit will be discarded so that the next read(2) will return a new event.
  */
 union fw_cdev_event {
 	struct fw_cdev_event_common common;