diff --git a/drivers/dca/dca-core.c b/drivers/dca/dca-core.c
index 33bd7534751820841d19732a5d5e79b4dea9adbf..25b743abfb59442b52ccec0057573716249bdbbf 100644
--- a/drivers/dca/dca-core.c
+++ b/drivers/dca/dca-core.c
@@ -1,5 +1,5 @@
 /*
- * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index 732fa1ec36ab3ae885b784ca1ea5bb863cc3c58f..e190d8b30700c40858fceb83afa05f49d9ce8d2e 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -430,13 +430,15 @@ late_initcall(dmatest_init);
 static void __exit dmatest_exit(void)
 {
 	struct dmatest_chan *dtc, *_dtc;
+	struct dma_chan *chan;
 
 	list_for_each_entry_safe(dtc, _dtc, &dmatest_channels, node) {
 		list_del(&dtc->node);
+		chan = dtc->chan;
 		dmatest_cleanup_channel(dtc);
 		pr_debug("dmatest: dropped channel %s\n",
-			 dma_chan_name(dtc->chan));
-		dma_release_channel(dtc->chan);
+			 dma_chan_name(chan));
+		dma_release_channel(chan);
 	}
 }
 module_exit(dmatest_exit);
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index 70126a60623939dddc6af7a59aa7b1eac8a51637..86d6da47f558765736149344b2c595b13a289f3f 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -158,7 +158,8 @@ static void dma_start(struct fsl_dma_chan *fsl_chan)
 
 static void dma_halt(struct fsl_dma_chan *fsl_chan)
 {
-	int i = 0;
+	int i;
+
 	DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr,
 		DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) | FSL_DMA_MR_CA,
 		32);
@@ -166,8 +167,11 @@ static void dma_halt(struct fsl_dma_chan *fsl_chan)
 		DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) & ~(FSL_DMA_MR_CS
 		| FSL_DMA_MR_EMS_EN | FSL_DMA_MR_CA), 32);
 
-	while (!dma_is_idle(fsl_chan) && (i++ < 100))
+	for (i = 0; i < 100; i++) {
+		if (dma_is_idle(fsl_chan))
+			break;
 		udelay(10);
+	}
 	if (i >= 100 && !dma_is_idle(fsl_chan))
 		dev_err(fsl_chan->dev, "DMA halt timeout!\n");
 }
diff --git a/drivers/dma/ioat.c b/drivers/dma/ioat.c
index 4105d6575b645dc7674c35ea5bca0c60bde89d9f..ed83dd9df192a5a4b65d5f1f15b3e1e2349178b3 100644
--- a/drivers/dma/ioat.c
+++ b/drivers/dma/ioat.c
@@ -1,6 +1,6 @@
 /*
  * Intel I/OAT DMA Linux driver
- * Copyright(c) 2007 Intel Corporation.
+ * Copyright(c) 2007 - 2009 Intel Corporation.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
diff --git a/drivers/dma/ioat_dca.c b/drivers/dma/ioat_dca.c
index 6cf622da0286481fccb32a73285c72c83fb6a57b..c012a1e150431972649b10a502cf658f9a71320b 100644
--- a/drivers/dma/ioat_dca.c
+++ b/drivers/dma/ioat_dca.c
@@ -1,6 +1,6 @@
 /*
  * Intel I/OAT DMA Linux driver
- * Copyright(c) 2007 Intel Corporation.
+ * Copyright(c) 2007 - 2009 Intel Corporation.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -49,6 +49,23 @@
 
 #define DCA_TAG_MAP_MASK 0xDF
 
+/* expected tag map bytes for I/OAT ver.2 */
+#define DCA2_TAG_MAP_BYTE0 0x80
+#define DCA2_TAG_MAP_BYTE1 0x0
+#define DCA2_TAG_MAP_BYTE2 0x81
+#define DCA2_TAG_MAP_BYTE3 0x82
+#define DCA2_TAG_MAP_BYTE4 0x82
+
+/* verify if tag map matches expected values */
+static inline int dca2_tag_map_valid(u8 *tag_map)
+{
+	return ((tag_map[0] == DCA2_TAG_MAP_BYTE0) &&
+		(tag_map[1] == DCA2_TAG_MAP_BYTE1) &&
+		(tag_map[2] == DCA2_TAG_MAP_BYTE2) &&
+		(tag_map[3] == DCA2_TAG_MAP_BYTE3) &&
+		(tag_map[4] == DCA2_TAG_MAP_BYTE4));
+}
+
 /*
  * "Legacy" DCA systems do not implement the DCA register set in the
  * I/OAT device.  Software needs direct support for their tag mappings.
@@ -452,6 +469,13 @@ struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase)
 			ioatdca->tag_map[i] = 0;
 	}
 
+	if (!dca2_tag_map_valid(ioatdca->tag_map)) {
+		dev_err(&pdev->dev, "APICID_TAG_MAP set incorrectly by BIOS, "
+			"disabling DCA\n");
+		free_dca_provider(dca);
+		return NULL;
+	}
+
 	err = register_dca_provider(dca, &pdev->dev);
 	if (err) {
 		free_dca_provider(dca);
diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index b3759c4b65360c0c3b72664c0a675887474f041e..5905cd36bcd23b43b86dcc532a1a70cc5ce5ce58 100644
--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -1,6 +1,6 @@
 /*
  * Intel I/OAT DMA Linux driver
- * Copyright(c) 2004 - 2007 Intel Corporation.
+ * Copyright(c) 2004 - 2009 Intel Corporation.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -189,11 +189,13 @@ static int ioat_dma_enumerate_channels(struct ioatdma_device *device)
 		ioat_chan->xfercap = xfercap;
 		ioat_chan->desccount = 0;
 		INIT_DELAYED_WORK(&ioat_chan->work, ioat_dma_chan_reset_part2);
-		if (ioat_chan->device->version != IOAT_VER_1_2) {
-			writel(IOAT_DCACTRL_CMPL_WRITE_ENABLE
-					| IOAT_DMA_DCA_ANY_CPU,
-				ioat_chan->reg_base + IOAT_DCACTRL_OFFSET);
-		}
+		if (ioat_chan->device->version == IOAT_VER_2_0)
+			writel(IOAT_DCACTRL_CMPL_WRITE_ENABLE |
+			       IOAT_DMA_DCA_ANY_CPU,
+			       ioat_chan->reg_base + IOAT_DCACTRL_OFFSET);
+		else if (ioat_chan->device->version == IOAT_VER_3_0)
+			writel(IOAT_DMA_DCA_ANY_CPU,
+			       ioat_chan->reg_base + IOAT_DCACTRL_OFFSET);
 		spin_lock_init(&ioat_chan->cleanup_lock);
 		spin_lock_init(&ioat_chan->desc_lock);
 		INIT_LIST_HEAD(&ioat_chan->free_desc);
@@ -1169,9 +1171,8 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan)
 				 * up if the client is done with the descriptor
 				 */
 				if (async_tx_test_ack(&desc->async_tx)) {
-					list_del(&desc->node);
-					list_add_tail(&desc->node,
-						      &ioat_chan->free_desc);
+					list_move_tail(&desc->node,
+						       &ioat_chan->free_desc);
 				} else
 					desc->async_tx.cookie = 0;
 			} else {
@@ -1362,6 +1363,7 @@ static int ioat_dma_self_test(struct ioatdma_device *device)
 	dma_cookie_t cookie;
 	int err = 0;
 	struct completion cmp;
+	unsigned long tmo;
 
 	src = kzalloc(sizeof(u8) * IOAT_TEST_SIZE, GFP_KERNEL);
 	if (!src)
@@ -1413,9 +1415,10 @@ static int ioat_dma_self_test(struct ioatdma_device *device)
 	}
 	device->common.device_issue_pending(dma_chan);
 
-	wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
+	tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
 
-	if (device->common.device_is_tx_complete(dma_chan, cookie, NULL, NULL)
+	if (tmo == 0 ||
+	    device->common.device_is_tx_complete(dma_chan, cookie, NULL, NULL)
 					!= DMA_SUCCESS) {
 		dev_err(&device->pdev->dev,
 			"Self-test copy timed out, disabling\n");
@@ -1657,6 +1660,13 @@ struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev,
 		" %d channels, device version 0x%02x, driver version %s\n",
 		device->common.chancnt, device->version, IOAT_DMA_VERSION);
 
+	if (!device->common.chancnt) {
+		dev_err(&device->pdev->dev,
+			"Intel(R) I/OAT DMA Engine problem found: "
+			"zero channels detected\n");
+		goto err_setup_interrupts;
+	}
+
 	err = ioat_dma_setup_interrupts(device);
 	if (err)
 		goto err_setup_interrupts;
@@ -1696,6 +1706,9 @@ void ioat_dma_remove(struct ioatdma_device *device)
 	struct dma_chan *chan, *_chan;
 	struct ioat_dma_chan *ioat_chan;
 
+	if (device->version != IOAT_VER_3_0)
+		cancel_delayed_work(&device->work);
+
 	ioat_dma_remove_interrupts(device);
 
 	dma_async_device_unregister(&device->common);
@@ -1707,10 +1720,6 @@ void ioat_dma_remove(struct ioatdma_device *device)
 	pci_release_regions(device->pdev);
 	pci_disable_device(device->pdev);
 
-	if (device->version != IOAT_VER_3_0) {
-		cancel_delayed_work(&device->work);
-	}
-
 	list_for_each_entry_safe(chan, _chan,
 				 &device->common.channels, device_node) {
 		ioat_chan = to_ioat_chan(chan);
diff --git a/drivers/dma/ioatdma.h b/drivers/dma/ioatdma.h
index a3306d0e1372a44b2950bc06d220d9b716f0bb00..a52ff4bd4601f78dbfe3fe472bb0b26c568e422d 100644
--- a/drivers/dma/ioatdma.h
+++ b/drivers/dma/ioatdma.h
@@ -1,5 +1,5 @@
 /*
- * Copyright(c) 2004 - 2007 Intel Corporation. All rights reserved.
+ * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
@@ -29,7 +29,7 @@
 #include <linux/pci_ids.h>
 #include <net/tcp.h>
 
-#define IOAT_DMA_VERSION  "3.30"
+#define IOAT_DMA_VERSION  "3.64"
 
 enum ioat_interrupt {
 	none = 0,
@@ -135,12 +135,14 @@ static inline void ioat_set_tcp_copy_break(struct ioatdma_device *dev)
 	#ifdef CONFIG_NET_DMA
 	switch (dev->version) {
 	case IOAT_VER_1_2:
-	case IOAT_VER_3_0:
 		sysctl_tcp_dma_copybreak = 4096;
 		break;
 	case IOAT_VER_2_0:
 		sysctl_tcp_dma_copybreak = 2048;
 		break;
+	case IOAT_VER_3_0:
+		sysctl_tcp_dma_copybreak = 262144;
+		break;
 	}
 	#endif
 }
diff --git a/drivers/dma/ioatdma_hw.h b/drivers/dma/ioatdma_hw.h
index f1ae2c776f7487b40e695395e3562679f420b29e..afa57eef86c946e685d13b8e2e7554ec66a7ff6b 100644
--- a/drivers/dma/ioatdma_hw.h
+++ b/drivers/dma/ioatdma_hw.h
@@ -1,5 +1,5 @@
 /*
- * Copyright(c) 2004 - 2007 Intel Corporation. All rights reserved.
+ * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
diff --git a/drivers/dma/ioatdma_registers.h b/drivers/dma/ioatdma_registers.h
index 827cb503cac6979a0fa98e3fbd25a113e14fda27..49bc277424f8c319b3a46369fe13e9339dc6cce6 100644
--- a/drivers/dma/ioatdma_registers.h
+++ b/drivers/dma/ioatdma_registers.h
@@ -1,5 +1,5 @@
 /*
- * Copyright(c) 2004 - 2007 Intel Corporation. All rights reserved.
+ * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c
index 647374acba94a7c526d04236af5a855f81b7258c..16adbe61cfb2cd60efd1a01246be3f9c9f4eac43 100644
--- a/drivers/dma/iop-adma.c
+++ b/drivers/dma/iop-adma.c
@@ -928,19 +928,19 @@ iop_adma_xor_zero_sum_self_test(struct iop_adma_device *device)
 
 	for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
 		xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
-		if (!xor_srcs[src_idx])
-			while (src_idx--) {
+		if (!xor_srcs[src_idx]) {
+			while (src_idx--)
 				__free_page(xor_srcs[src_idx]);
-				return -ENOMEM;
-			}
+			return -ENOMEM;
+		}
 	}
 
 	dest = alloc_page(GFP_KERNEL);
-	if (!dest)
-		while (src_idx--) {
+	if (!dest) {
+		while (src_idx--)
 			__free_page(xor_srcs[src_idx]);
-			return -ENOMEM;
-		}
+		return -ENOMEM;
+	}
 
 	/* Fill in src buffers */
 	for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
diff --git a/drivers/dma/ipu/ipu_idmac.c b/drivers/dma/ipu/ipu_idmac.c
index 1f154d08e98f88cfbff23c192bf473dcdfa5cad0..ae50a9d1a4e683ae4665debfdb8a1294bbde05cc 100644
--- a/drivers/dma/ipu/ipu_idmac.c
+++ b/drivers/dma/ipu/ipu_idmac.c
@@ -729,7 +729,7 @@ static int ipu_init_channel_buffer(struct idmac_channel *ichan,
 
 	ichan->status = IPU_CHANNEL_READY;
 
-	spin_unlock_irqrestore(ipu->lock, flags);
+	spin_unlock_irqrestore(&ipu->lock, flags);
 
 	return 0;
 }
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index 5d5d5b31867fc9e28dd70696e52ad00fa68c997c..cb7f26fb9f188ce594081069bd61c6e99c957930 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -1019,19 +1019,19 @@ mv_xor_xor_self_test(struct mv_xor_device *device)
 
 	for (src_idx = 0; src_idx < MV_XOR_NUM_SRC_TEST; src_idx++) {
 		xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
-		if (!xor_srcs[src_idx])
-			while (src_idx--) {
+		if (!xor_srcs[src_idx]) {
+			while (src_idx--)
 				__free_page(xor_srcs[src_idx]);
-				return -ENOMEM;
-			}
+			return -ENOMEM;
+		}
 	}
 
 	dest = alloc_page(GFP_KERNEL);
-	if (!dest)
-		while (src_idx--) {
+	if (!dest) {
+		while (src_idx--)
 			__free_page(xor_srcs[src_idx]);
-			return -ENOMEM;
-		}
+		return -ENOMEM;
+	}
 
 	/* Fill in src buffers */
 	for (src_idx = 0; src_idx < MV_XOR_NUM_SRC_TEST; src_idx++) {
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index f0413845f20ee75481543cb97c570d6dbda142b4..1956c8d46d326ea98c2286a6f3f47e8e428518a1 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -97,7 +97,6 @@ typedef struct { DECLARE_BITMAP(bits, DMA_TX_TYPE_END); } dma_cap_mask_t;
 
 /**
  * struct dma_chan_percpu - the per-CPU part of struct dma_chan
- * @refcount: local_t used for open-coded "bigref" counting
  * @memcpy_count: transaction counter
  * @bytes_transferred: byte counter
  */
@@ -114,9 +113,6 @@ struct dma_chan_percpu {
  * @cookie: last cookie value returned to client
  * @chan_id: channel ID for sysfs
  * @dev: class device for sysfs
- * @refcount: kref, used in "bigref" slow-mode
- * @slow_ref: indicates that the DMA channel is free
- * @rcu: the DMA channel's RCU head
  * @device_node: used to add this to the device chan list
  * @local: per-cpu pointer to a struct dma_chan_percpu
  * @client-count: how many clients are using this channel
@@ -213,8 +209,6 @@ struct dma_async_tx_descriptor {
  * @global_node: list_head for global dma_device_list
  * @cap_mask: one or more dma_capability flags
  * @max_xor: maximum number of xor sources, 0 if no capability
- * @refcount: reference count
- * @done: IO completion struct
  * @dev_id: unique device ID
  * @dev: struct device reference for dma mapping api
  * @device_alloc_chan_resources: allocate resources and return the
@@ -227,6 +221,7 @@ struct dma_async_tx_descriptor {
  * @device_prep_dma_interrupt: prepares an end of chain interrupt operation
  * @device_prep_slave_sg: prepares a slave dma operation
  * @device_terminate_all: terminate all pending operations
+ * @device_is_tx_complete: poll for transaction completion
  * @device_issue_pending: push pending transactions to hardware
  */
 struct dma_device {