From 34537731d7f64d20116fbef4a665ec6a37195573 Mon Sep 17 00:00:00 2001 From: Arvid Brodin Date: Tue, 26 Apr 2011 21:47:37 +0200 Subject: [PATCH] usb/isp1760: Clean up urb enqueueing This collects urb enqueue code that was spread out all over the place into a couple of more readable functions. Signed-off-by: Arvid Brodin Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/isp1760-hcd.c | 327 +++++++++++++-------------------- 1 file changed, 129 insertions(+), 198 deletions(-) diff --git a/drivers/usb/host/isp1760-hcd.c b/drivers/usb/host/isp1760-hcd.c index ff3b3165d19d..6b2bf4684f45 100644 --- a/drivers/usb/host/isp1760-hcd.c +++ b/drivers/usb/host/isp1760-hcd.c @@ -272,7 +272,7 @@ static void init_memory(struct isp1760_hcd *priv) payload_addr += priv->memory_pool[curr + i].size; } - BUG_ON(payload_addr - priv->memory_pool[0].start > PAYLOAD_AREA_SIZE); + WARN_ON(payload_addr - priv->memory_pool[0].start > PAYLOAD_AREA_SIZE); } static void alloc_mem(struct usb_hcd *hcd, struct isp1760_qtd *qtd) @@ -280,7 +280,7 @@ static void alloc_mem(struct usb_hcd *hcd, struct isp1760_qtd *qtd) struct isp1760_hcd *priv = hcd_to_priv(hcd); int i; - BUG_ON(qtd->payload_addr); + WARN_ON(qtd->payload_addr); if (!qtd->length) return; @@ -318,7 +318,7 @@ static void free_mem(struct usb_hcd *hcd, struct isp1760_qtd *qtd) for (i = 0; i < BLOCKS; i++) { if (priv->memory_pool[i].start == qtd->payload_addr) { - BUG_ON(priv->memory_pool[i].free); + WARN_ON(priv->memory_pool[i].free); priv->memory_pool[i].free = 1; qtd->payload_addr = 0; return; @@ -379,7 +379,7 @@ static int ehci_reset(struct usb_hcd *hcd) static void qh_destroy(struct isp1760_qh *qh) { - BUG_ON(!list_empty(&qh->qtd_list)); + WARN_ON(!list_empty(&qh->qtd_list)); kmem_cache_free(qh_cachep, qh); } @@ -738,23 +738,6 @@ static void transform_into_int(struct isp1760_qh *qh, transform_add_int(qh, qtd, ptd); } -static int qtd_fill(struct isp1760_qtd *qtd, void *databuffer, size_t len, - u32 token) -{ - int count; - - qtd->data_buffer = databuffer; - qtd->packet_type = GET_QTD_TOKEN_TYPE(token); - - if (len > MAX_PAYLOAD_SIZE) - count = MAX_PAYLOAD_SIZE; - else - count = len; - - qtd->length = count; - return count; -} - static int check_error(struct usb_hcd *hcd, struct ptd *ptd) { int error = 0; @@ -948,9 +931,25 @@ __acquires(priv->lock) spin_lock(&priv->lock); } -static void isp1760_qtd_free(struct isp1760_qtd *qtd) +static struct isp1760_qtd *qtd_alloc(gfp_t flags, struct urb *urb, + u8 packet_type) +{ + struct isp1760_qtd *qtd; + + qtd = kmem_cache_zalloc(qtd_cachep, flags); + if (!qtd) + return NULL; + + INIT_LIST_HEAD(&qtd->qtd_list); + qtd->urb = urb; + qtd->packet_type = packet_type; + + return qtd; +} + +static void qtd_free(struct isp1760_qtd *qtd) { - BUG_ON(qtd->payload_addr); + WARN_ON(qtd->payload_addr); kmem_cache_free(qtd_cachep, qtd); } @@ -965,7 +964,7 @@ static struct isp1760_qtd *clean_this_qtd(struct isp1760_qtd *qtd, tmp_qtd = list_entry(qtd->qtd_list.next, struct isp1760_qtd, qtd_list); list_del(&qtd->qtd_list); - isp1760_qtd_free(qtd); + qtd_free(qtd); return tmp_qtd; } @@ -1294,210 +1293,95 @@ static void do_intl_int(struct usb_hcd *hcd) } } -static struct isp1760_qh *qh_make(struct usb_hcd *hcd, struct urb *urb, - gfp_t flags) -{ - struct isp1760_qh *qh; - int is_input, type; - - qh = isp1760_qh_alloc(flags); - if (!qh) - return qh; - - /* - * init endpoint/device data for this QH - */ - is_input = usb_pipein(urb->pipe); - type = usb_pipetype(urb->pipe); - - if (!usb_pipecontrol(urb->pipe)) - usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), !is_input, - 1); - return qh; -} - -/* - * For control/bulk/interrupt, return QH with these TDs appended. - * Allocates and initializes the QH if necessary. - * Returns null if it can't allocate a QH it needs to. - * If the QH has TDs (urbs) already, that's great. - */ -static struct isp1760_qh *qh_append_tds(struct usb_hcd *hcd, - struct urb *urb, struct list_head *qtd_list, int epnum, - void **ptr) +static int qtd_fill(struct isp1760_qtd *qtd, void *databuffer, size_t len) { - struct isp1760_qh *qh; - - qh = (struct isp1760_qh *)*ptr; - if (!qh) { - /* can't sleep here, we have priv->lock... */ - qh = qh_make(hcd, urb, GFP_ATOMIC); - if (!qh) - return qh; - *ptr = qh; - } + qtd->data_buffer = databuffer; - list_splice(qtd_list, qh->qtd_list.prev); + if (len > MAX_PAYLOAD_SIZE) + len = MAX_PAYLOAD_SIZE; + qtd->length = len; - return qh; + return qtd->length; } -static void qtd_list_free(struct urb *urb, struct list_head *qtd_list) +static void qtd_list_free(struct list_head *qtd_list) { - struct list_head *entry, *temp; + struct isp1760_qtd *qtd, *qtd_next; - list_for_each_safe(entry, temp, qtd_list) { - struct isp1760_qtd *qtd; - - qtd = list_entry(entry, struct isp1760_qtd, qtd_list); + list_for_each_entry_safe(qtd, qtd_next, qtd_list, qtd_list) { list_del(&qtd->qtd_list); - isp1760_qtd_free(qtd); + qtd_free(qtd); } } -static int isp1760_prepare_enqueue(struct usb_hcd *hcd, struct urb *urb, - struct list_head *qtd_list, gfp_t mem_flags, packet_enqueue *p) -{ - struct isp1760_hcd *priv = hcd_to_priv(hcd); - struct isp1760_qtd *qtd; - int epnum; - unsigned long flags; - struct isp1760_qh *qh = NULL; - int rc; - int qh_busy; - - qtd = list_entry(qtd_list->next, struct isp1760_qtd, qtd_list); - epnum = urb->ep->desc.bEndpointAddress; - - spin_lock_irqsave(&priv->lock, flags); - if (!HCD_HW_ACCESSIBLE(hcd)) { - rc = -ESHUTDOWN; - goto done; - } - rc = usb_hcd_link_urb_to_ep(hcd, urb); - if (rc) - goto done; - - qh = urb->ep->hcpriv; - if (qh) - qh_busy = !list_empty(&qh->qtd_list); - else - qh_busy = 0; - - qh = qh_append_tds(hcd, urb, qtd_list, epnum, &urb->ep->hcpriv); - if (!qh) { - usb_hcd_unlink_urb_from_ep(hcd, urb); - rc = -ENOMEM; - goto done; - } - - if (!qh_busy) - p(hcd, qh, qtd); - -done: - spin_unlock_irqrestore(&priv->lock, flags); - if (!qh) - qtd_list_free(urb, qtd_list); - return rc; -} - -static struct isp1760_qtd *isp1760_qtd_alloc(gfp_t flags) -{ - struct isp1760_qtd *qtd; - - qtd = kmem_cache_zalloc(qtd_cachep, flags); - if (qtd) - INIT_LIST_HEAD(&qtd->qtd_list); - - return qtd; -} - /* - * create a list of filled qtds for this URB; won't link into qh. + * Packetize urb->transfer_buffer into list of packets of size wMaxPacketSize. + * Also calculate the PID type (SETUP/IN/OUT) for each packet. */ #define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff) -static struct list_head *qh_urb_transaction(struct usb_hcd *hcd, +static void packetize_urb(struct usb_hcd *hcd, struct urb *urb, struct list_head *head, gfp_t flags) { struct isp1760_qtd *qtd; void *buf; - int len, maxpacket; - int is_input; - u32 token; + int len, maxpacketsize; + u8 packet_type; /* * URBs map to sequences of QTDs: one logical transaction */ - qtd = isp1760_qtd_alloc(flags); - if (!qtd) - return NULL; - list_add_tail(&qtd->qtd_list, head); - qtd->urb = urb; - urb->status = -EINPROGRESS; + if (!urb->transfer_buffer && urb->transfer_buffer_length) { + /* XXX This looks like usb storage / SCSI bug */ + dev_err(hcd->self.controller, + "buf is null, dma is %08lx len is %d\n", + (long unsigned)urb->transfer_dma, + urb->transfer_buffer_length); + WARN_ON(1); + } - token = 0; - /* for split transactions, SplitXState initialized to zero */ + if (usb_pipein(urb->pipe)) + packet_type = IN_PID; + else + packet_type = OUT_PID; - len = urb->transfer_buffer_length; - is_input = usb_pipein(urb->pipe); if (usb_pipecontrol(urb->pipe)) { - /* SETUP pid */ - qtd_fill(qtd, urb->setup_packet, - sizeof(struct usb_ctrlrequest), - token | SETUP_PID); - - /* ... and always at least one more pid */ - qtd = isp1760_qtd_alloc(flags); + qtd = qtd_alloc(flags, urb, SETUP_PID); if (!qtd) goto cleanup; - qtd->urb = urb; + qtd_fill(qtd, urb->setup_packet, sizeof(struct usb_ctrlrequest)); list_add_tail(&qtd->qtd_list, head); /* for zero length DATA stages, STATUS is always IN */ - if (len == 0) - token |= IN_PID; + if (urb->transfer_buffer_length == 0) + packet_type = IN_PID; } - /* - * data transfer stage: buffer setup - */ - buf = urb->transfer_buffer; - - if (is_input) - token |= IN_PID; - else - token |= OUT_PID; - - maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input)); + maxpacketsize = max_packet(usb_maxpacket(urb->dev, urb->pipe, + usb_pipeout(urb->pipe))); /* * buffer gets wrapped in one or more qtds; * last one may be "short" (including zero len) * and may serve as a control status ack */ + buf = urb->transfer_buffer; + len = urb->transfer_buffer_length; + for (;;) { int this_qtd_len; - if (!buf && len) { - /* XXX This looks like usb storage / SCSI bug */ - dev_err(hcd->self.controller, "buf is null, dma is %08lx len is %d\n", - (long unsigned)urb->transfer_dma, len); - WARN_ON(1); - } + qtd = qtd_alloc(flags, urb, packet_type); + if (!qtd) + goto cleanup; + this_qtd_len = qtd_fill(qtd, buf, len); + list_add_tail(&qtd->qtd_list, head); - this_qtd_len = qtd_fill(qtd, buf, len, token); len -= this_qtd_len; buf += this_qtd_len; if (len <= 0) break; - - qtd = isp1760_qtd_alloc(flags); - if (!qtd) - goto cleanup; - qtd->urb = urb; - list_add_tail(&qtd->qtd_list, head); } /* @@ -1509,31 +1393,78 @@ static struct list_head *qh_urb_transaction(struct usb_hcd *hcd, if (usb_pipecontrol(urb->pipe)) { one_more = 1; - /* "in" <--> "out" */ - token ^= IN_PID; + if (packet_type == IN_PID) + packet_type = OUT_PID; + else + packet_type = IN_PID; } else if (usb_pipebulk(urb->pipe) && (urb->transfer_flags & URB_ZERO_PACKET) - && !(urb->transfer_buffer_length % maxpacket)) { + && !(urb->transfer_buffer_length % + maxpacketsize)) { one_more = 1; } if (one_more) { - qtd = isp1760_qtd_alloc(flags); + qtd = qtd_alloc(flags, urb, packet_type); if (!qtd) goto cleanup; - qtd->urb = urb; - list_add_tail(&qtd->qtd_list, head); /* never any data in such packets */ - qtd_fill(qtd, NULL, 0, token); + qtd_fill(qtd, NULL, 0); + list_add_tail(&qtd->qtd_list, head); } } - qtd->status = 0; - return head; + return; cleanup: - qtd_list_free(urb, head); - return NULL; + qtd_list_free(head); +} + +static int enqueue_qtdlist(struct usb_hcd *hcd, struct urb *urb, + struct list_head *qtd_list, gfp_t mem_flags, packet_enqueue *p) +{ + struct isp1760_hcd *priv = hcd_to_priv(hcd); + struct isp1760_qtd *qtd; + struct isp1760_qh *qh = NULL; + unsigned long flags; + int qh_empty; + int rc; + + spin_lock_irqsave(&priv->lock, flags); + if (!HCD_HW_ACCESSIBLE(hcd)) { + rc = -ESHUTDOWN; + goto done; + } + rc = usb_hcd_link_urb_to_ep(hcd, urb); + if (rc) + goto done; + + qh = urb->ep->hcpriv; + if (!qh) { + qh = isp1760_qh_alloc(GFP_ATOMIC); + if (!qh) { + usb_hcd_unlink_urb_from_ep(hcd, urb); + rc = -ENOMEM; + goto done; + } + if (!usb_pipecontrol(urb->pipe)) + usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), + !usb_pipein(urb->pipe), 1); + urb->ep->hcpriv = qh; + } + + qh_empty = list_empty(&qh->qtd_list); + list_splice_tail(qtd_list, &qh->qtd_list); + if (qh_empty) { + qtd = list_entry(qtd_list->next, struct isp1760_qtd, qtd_list); + p(hcd, qh, qtd); + } + +done: + spin_unlock_irqrestore(&priv->lock, flags); + if (!qh) + qtd_list_free(qtd_list); + return rc; } static int isp1760_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, @@ -1547,14 +1478,10 @@ static int isp1760_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, switch (usb_pipetype(urb->pipe)) { case PIPE_CONTROL: case PIPE_BULK: - if (!qh_urb_transaction(hcd, urb, &qtd_list, mem_flags)) - return -ENOMEM; - pe = enqueue_an_ATL_packet; + pe = enqueue_an_ATL_packet; break; case PIPE_INTERRUPT: - if (!qh_urb_transaction(hcd, urb, &qtd_list, mem_flags)) - return -ENOMEM; pe = enqueue_an_INT_packet; break; @@ -1564,7 +1491,11 @@ static int isp1760_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, return -EPIPE; } - return isp1760_prepare_enqueue(hcd, urb, &qtd_list, mem_flags, pe); + packetize_urb(hcd, urb, &qtd_list, mem_flags); + if (list_empty(&qtd_list)) + return -ENOMEM; + + return enqueue_qtdlist(hcd, urb, &qtd_list, mem_flags, pe); } static int isp1760_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) @@ -1605,7 +1536,7 @@ static int isp1760_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) for (i = 0; i < 32; i++) { if (!ints[i].qh) continue; - BUG_ON(!ints[i].qtd); + WARN_ON(!ints[i].qtd); if (ints[i].qtd->urb == urb) { u32 skip_map; -- GitLab