Merge tag 'firewire-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394

Pull IEEE 1394 (FireWire) subsystem updates from Stefan Richter:

 - Fix mismatch between DMA mapping direction (was wrong) and DMA
   synchronization direction (was correct) of isochronous reception
   buffers of userspace drivers if vma-mapped for R/W access.  For
   example, libdc1394 was affected.

 - more consistent retry stategy in device discovery/ rediscovery, and
   improved failure diagnostics

 - various small cleanups, e.g. use SCSI layer's DMA mapping API in
   firewire-sbp2

* tag 'firewire-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394:
  firewire: sbp2: document the absence of alignment requirements
  firewire: sbp2: remove superfluous blk_queue_max_segment_size() call
  firewire: sbp2: use scsi_dma_(un)map
  firewire: sbp2: give correct DMA device to scsi framework
  firewire: core: fw_device_refresh(): clean up error handling
  firewire: core: log config rom reading errors
  firewire: core: log error in case of failed bus manager lock
  firewire: move rcode_string() to core
  firewire: core: improve reread_config_rom() interface
  firewire: core: wait for inaccessible devices after bus reset
  firewire: ohci: omit spinlock IRQ flags where possible
  firewire: ohci: correct signedness of a local variable
  firewire: core: fix DMA mapping direction
  firewire: use module_pci_driver

13 files changed, 218 insertions, 189 deletions

diff --git a/drivers/firewire/core-card.c b/drivers/firewire/core-card.c
index f5552b3..57ea7f4 100644
--- a/drivers/firewire/core-card.c
+++ b/drivers/firewire/core-card.c
@@ -421,8 +421,8 @@ static void bm_work(struct work_struct *work)
 			 * root, and thus, IRM.
 			 */
 			new_root_id = local_id;
-			fw_notice(card, "%s, making local node (%02x) root\n",
-				  "BM lock failed", new_root_id);
+			fw_notice(card, "BM lock failed (%s), making local node (%02x) root\n",
+				  fw_rcode_string(rcode), new_root_id);
 			goto pick_me;
 		}
 	} else if (card->bm_generation != generation) {
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index 2e6b245..2783f69 100644
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -22,6 +22,7 @@
 #include <linux/compat.h>
 #include <linux/delay.h>
 #include <linux/device.h>
+#include <linux/dma-mapping.h>
 #include <linux/errno.h>
 #include <linux/firewire.h>
 #include <linux/firewire-cdev.h>
@@ -70,6 +71,7 @@ struct client {
 	u64 iso_closure;
 	struct fw_iso_buffer buffer;
 	unsigned long vm_start;
+	bool buffer_is_mapped;
 
 	struct list_head phy_receiver_link;
 	u64 phy_receiver_closure;
@@ -959,11 +961,20 @@ static void iso_mc_callback(struct fw_iso_context *context,
 		    sizeof(e->interrupt), NULL, 0);
 }
 
+static enum dma_data_direction iso_dma_direction(struct fw_iso_context *context)
+{
+		if (context->type == FW_ISO_CONTEXT_TRANSMIT)
+			return DMA_TO_DEVICE;
+		else
+			return DMA_FROM_DEVICE;
+}
+
 static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)
 {
 	struct fw_cdev_create_iso_context *a = &arg->create_iso_context;
 	struct fw_iso_context *context;
 	fw_iso_callback_t cb;
+	int ret;
 
 	BUILD_BUG_ON(FW_CDEV_ISO_CONTEXT_TRANSMIT != FW_ISO_CONTEXT_TRANSMIT ||
 		     FW_CDEV_ISO_CONTEXT_RECEIVE  != FW_ISO_CONTEXT_RECEIVE  ||
@@ -1004,8 +1015,21 @@ static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)
 	if (client->iso_context != NULL) {
 		spin_unlock_irq(&client->lock);
 		fw_iso_context_destroy(context);
+
 		return -EBUSY;
 	}
+	if (!client->buffer_is_mapped) {
+		ret = fw_iso_buffer_map_dma(&client->buffer,
+					    client->device->card,
+					    iso_dma_direction(context));
+		if (ret < 0) {
+			spin_unlock_irq(&client->lock);
+			fw_iso_context_destroy(context);
+
+			return ret;
+		}
+		client->buffer_is_mapped = true;
+	}
 	client->iso_closure = a->closure;
 	client->iso_context = context;
 	spin_unlock_irq(&client->lock);
@@ -1651,7 +1675,6 @@ static long fw_device_op_compat_ioctl(struct file *file,
 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	struct client *client = file->private_data;
-	enum dma_data_direction direction;
 	unsigned long size;
 	int page_count, ret;
 
@@ -1674,20 +1697,28 @@ static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
 	if (size & ~PAGE_MASK)
 		return -EINVAL;
 
-	if (vma->vm_flags & VM_WRITE)
-		direction = DMA_TO_DEVICE;
-	else
-		direction = DMA_FROM_DEVICE;
-
-	ret = fw_iso_buffer_init(&client->buffer, client->device->card,
-				 page_count, direction);
+	ret = fw_iso_buffer_alloc(&client->buffer, page_count);
 	if (ret < 0)
 		return ret;
 
-	ret = fw_iso_buffer_map(&client->buffer, vma);
+	spin_lock_irq(&client->lock);
+	if (client->iso_context) {
+		ret = fw_iso_buffer_map_dma(&client->buffer,
+				client->device->card,
+				iso_dma_direction(client->iso_context));
+		client->buffer_is_mapped = (ret == 0);
+	}
+	spin_unlock_irq(&client->lock);
 	if (ret < 0)
-		fw_iso_buffer_destroy(&client->buffer, client->device->card);
+		goto fail;
 
+	ret = fw_iso_buffer_map_vma(&client->buffer, vma);
+	if (ret < 0)
+		goto fail;
+
+	return 0;
+ fail:
+	fw_iso_buffer_destroy(&client->buffer, client->device->card);
 	return ret;
 }
 
diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index 68109e9..4d460ef 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -481,6 +481,7 @@ static int read_rom(struct fw_device *device,
  * generation changes under us, read_config_rom will fail and get retried.
  * It's better to start all over in this case because the node from which we
  * are reading the ROM may have changed the ROM during the reset.
+ * Returns either a result code or a negative error code.
  */
 static int read_config_rom(struct fw_device *device, int generation)
 {
@@ -488,7 +489,7 @@ static int read_config_rom(struct fw_device *device, int generation)
 	const u32 *old_rom, *new_rom;
 	u32 *rom, *stack;
 	u32 sp, key;
-	int i, end, length, ret = -1;
+	int i, end, length, ret;
 
 	rom = kmalloc(sizeof(*rom) * MAX_CONFIG_ROM_SIZE +
 		      sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL);
@@ -502,18 +503,21 @@ static int read_config_rom(struct fw_device *device, int generation)
 
 	/* First read the bus info block. */
 	for (i = 0; i < 5; i++) {
-		if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
+		ret = read_rom(device, generation, i, &rom[i]);
+		if (ret != RCODE_COMPLETE)
 			goto out;
 		/*
-		 * As per IEEE1212 7.2, during power-up, devices can
+		 * As per IEEE1212 7.2, during initialization, devices can
 		 * reply with a 0 for the first quadlet of the config
 		 * rom to indicate that they are booting (for example,
 		 * if the firmware is on the disk of a external
 		 * harddisk).  In that case we just fail, and the
 		 * retry mechanism will try again later.
 		 */
-		if (i == 0 && rom[i] == 0)
+		if (i == 0 && rom[i] == 0) {
+			ret = RCODE_BUSY;
 			goto out;
+		}
 	}
 
 	device->max_speed = device->node->max_speed;
@@ -563,11 +567,14 @@ static int read_config_rom(struct fw_device *device, int generation)
 		 */
 		key = stack[--sp];
 		i = key & 0xffffff;
-		if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE))
+		if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE)) {
+			ret = -ENXIO;
 			goto out;
+		}
 
 		/* Read header quadlet for the block to get the length. */
-		if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
+		ret = read_rom(device, generation, i, &rom[i]);
+		if (ret != RCODE_COMPLETE)
 			goto out;
 		end = i + (rom[i] >> 16) + 1;
 		if (end > MAX_CONFIG_ROM_SIZE) {
@@ -590,8 +597,8 @@ static int read_config_rom(struct fw_device *device, int generation)
 		 * it references another block, and push it in that case.
 		 */
 		for (; i < end; i++) {
-			if (read_rom(device, generation, i, &rom[i]) !=
-			    RCODE_COMPLETE)
+			ret = read_rom(device, generation, i, &rom[i]);
+			if (ret != RCODE_COMPLETE)
 				goto out;
 
 			if ((key >> 30) != 3 || (rom[i] >> 30) < 2)
@@ -619,8 +626,10 @@ static int read_config_rom(struct fw_device *device, int generation)
 
 	old_rom = device->config_rom;
 	new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
-	if (new_rom == NULL)
+	if (new_rom == NULL) {
+		ret = -ENOMEM;
 		goto out;
+	}
 
 	down_write(&fw_device_rwsem);
 	device->config_rom = new_rom;
@@ -628,7 +637,7 @@ static int read_config_rom(struct fw_device *device, int generation)
 	up_write(&fw_device_rwsem);
 
 	kfree(old_rom);
-	ret = 0;
+	ret = RCODE_COMPLETE;
 	device->max_rec	= rom[2] >> 12 & 0xf;
 	device->cmc	= rom[2] >> 30 & 1;
 	device->irmc	= rom[2] >> 31 & 1;
@@ -967,15 +976,17 @@ static void fw_device_init(struct work_struct *work)
 	 * device.
 	 */
 
-	if (read_config_rom(device, device->generation) < 0) {
+	ret = read_config_rom(device, device->generation);
+	if (ret != RCODE_COMPLETE) {
 		if (device->config_rom_retries < MAX_RETRIES &&
 		    atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
 			device->config_rom_retries++;
 			fw_schedule_device_work(device, RETRY_DELAY);
 		} else {
 			if (device->node->link_on)
-				fw_notice(card, "giving up on Config ROM for node id %x\n",
-					  device->node_id);
+				fw_notice(card, "giving up on node %x: reading config rom failed: %s\n",
+					  device->node_id,
+					  fw_rcode_string(ret));
 			if (device->node == card->root_node)
 				fw_schedule_bm_work(card, 0);
 			fw_device_release(&device->device);
@@ -1069,31 +1080,30 @@ static void fw_device_init(struct work_struct *work)
 	put_device(&device->device);	/* our reference */
 }
 
-enum {
-	REREAD_BIB_ERROR,
-	REREAD_BIB_GONE,
-	REREAD_BIB_UNCHANGED,
-	REREAD_BIB_CHANGED,
-};
-
 /* Reread and compare bus info block and header of root directory */
-static int reread_config_rom(struct fw_device *device, int generation)
+static int reread_config_rom(struct fw_device *device, int generation,
+			     bool *changed)
 {
 	u32 q;
-	int i;
+	int i, rcode;
 
 	for (i = 0; i < 6; i++) {
-		if (read_rom(device, generation, i, &q) != RCODE_COMPLETE)
-			return REREAD_BIB_ERROR;
+		rcode = read_rom(device, generation, i, &q);
+		if (rcode != RCODE_COMPLETE)
+			return rcode;
 
 		if (i == 0 && q == 0)
-			return REREAD_BIB_GONE;
+			/* inaccessible (see read_config_rom); retry later */
+			return RCODE_BUSY;
 
-		if (q != device->config_rom[i])
-			return REREAD_BIB_CHANGED;
+		if (q != device->config_rom[i]) {
+			*changed = true;
+			return RCODE_COMPLETE;
+		}
 	}
 
-	return REREAD_BIB_UNCHANGED;
+	*changed = false;
+	return RCODE_COMPLETE;
 }
 
 static void fw_device_refresh(struct work_struct *work)
@@ -1101,23 +1111,14 @@ static void fw_device_refresh(struct work_struct *work)
 	struct fw_device *device =
 		container_of(work, struct fw_device, work.work);
 	struct fw_card *card = device->card;
-	int node_id = device->node_id;
-
-	switch (reread_config_rom(device, device->generation)) {
-	case REREAD_BIB_ERROR:
-		if (device->config_rom_retries < MAX_RETRIES / 2 &&
-		    atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
-			device->config_rom_retries++;
-			fw_schedule_device_work(device, RETRY_DELAY / 2);
-
-			return;
-		}
-		goto give_up;
+	int ret, node_id = device->node_id;
+	bool changed;
 
-	case REREAD_BIB_GONE:
-		goto gone;
+	ret = reread_config_rom(device, device->generation, &changed);
+	if (ret != RCODE_COMPLETE)
+		goto failed_config_rom;
 
-	case REREAD_BIB_UNCHANGED:
+	if (!changed) {
 		if (atomic_cmpxchg(&device->state,
 				   FW_DEVICE_INITIALIZING,
 				   FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
@@ -1126,9 +1127,6 @@ static void fw_device_refresh(struct work_struct *work)
 		fw_device_update(work);
 		device->config_rom_retries = 0;
 		goto out;
-
-	case REREAD_BIB_CHANGED:
-		break;
 	}
 
 	/*
@@ -1137,16 +1135,9 @@ static void fw_device_refresh(struct work_struct *work)
 	 */
 	device_for_each_child(&device->device, NULL, shutdown_unit);
 
-	if (read_config_rom(device, device->generation) < 0) {
-		if (device->config_rom_retries < MAX_RETRIES &&
-		    atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
-			device->config_rom_retries++;
-			fw_schedule_device_work(device, RETRY_DELAY);
-
-			return;
-		}
-		goto give_up;
-	}
+	ret = read_config_rom(device, device->generation);
+	if (ret != RCODE_COMPLETE)
+		goto failed_config_rom;
 
 	fw_device_cdev_update(device);
 	create_units(device);
@@ -1163,9 +1154,16 @@ static void fw_device_refresh(struct work_struct *work)
 	device->config_rom_retries = 0;
 	goto out;
 
- give_up:
-	fw_notice(card, "giving up on refresh of device %s\n",
-		  dev_name(&device->device));
+ failed_config_rom:
+	if (device->config_rom_retries < MAX_RETRIES &&
+	    atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
+		device->config_rom_retries++;
+		fw_schedule_device_work(device, RETRY_DELAY);
+		return;
+	}
+
+	fw_notice(card, "giving up on refresh of device %s: %s\n",
+		  dev_name(&device->device), fw_rcode_string(ret));
  gone:
 	atomic_set(&device->state, FW_DEVICE_GONE);
 	PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
diff --git a/drivers/firewire/core-iso.c b/drivers/firewire/core-iso.c
index d156582..8382e27 100644
--- a/drivers/firewire/core-iso.c
+++ b/drivers/firewire/core-iso.c
@@ -39,52 +39,73 @@
  * Isochronous DMA context management
  */
 
-int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
-		       int page_count, enum dma_data_direction direction)
+int fw_iso_buffer_alloc(struct fw_iso_buffer *buffer, int page_count)
 {
-	int i, j;
-	dma_addr_t address;
-
-	buffer->page_count = page_count;
-	buffer->direction = direction;
+	int i;
 
+	buffer->page_count = 0;
+	buffer->page_count_mapped = 0;
 	buffer->pages = kmalloc(page_count * sizeof(buffer->pages[0]),
 				GFP_KERNEL);
 	if (buffer->pages == NULL)
-		goto out;
+		return -ENOMEM;
 
-	for (i = 0; i < buffer->page_count; i++) {
+	for (i = 0; i < page_count; i++) {
 		buffer->pages[i] = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
 		if (buffer->pages[i] == NULL)
-			goto out_pages;
+			break;
+	}
+	buffer->page_count = i;
+	if (i < page_count) {
+		fw_iso_buffer_destroy(buffer, NULL);
+		return -ENOMEM;
+	}
 
+	return 0;
+}
+
+int fw_iso_buffer_map_dma(struct fw_iso_buffer *buffer, struct fw_card *card,
+			  enum dma_data_direction direction)
+{
+	dma_addr_t address;
+	int i;
+
+	buffer->direction = direction;
+
+	for (i = 0; i < buffer->page_count; i++) {
 		address = dma_map_page(card->device, buffer->pages[i],
 				       0, PAGE_SIZE, direction);
-		if (dma_mapping_error(card->device, address)) {
-			__free_page(buffer->pages[i]);
-			goto out_pages;
-		}
+		if (dma_mapping_error(card->device, address))
+			break;
+
 		set_page_private(buffer->pages[i], address);
 	}
+	buffer->page_count_mapped = i;
+	if (i < buffer->page_count)
+		return -ENOMEM;
 
 	return 0;
+}
 
- out_pages:
-	for (j = 0; j < i; j++) {
-		address = page_private(buffer->pages[j]);
-		dma_unmap_page(card->device, address,
-			       PAGE_SIZE, direction);
-		__free_page(buffer->pages[j]);
-	}
-	kfree(buffer->pages);
- out:
-	buffer->pages = NULL;
+int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
+		       int page_count, enum dma_data_direction direction)
+{
+	int ret;
+
+	ret = fw_iso_buffer_alloc(buffer, page_count);
+	if (ret < 0)
+		return ret;
+
+	ret = fw_iso_buffer_map_dma(buffer, card, direction);
+	if (ret < 0)
+		fw_iso_buffer_destroy(buffer, card);
 
-	return -ENOMEM;
+	return ret;
 }
 EXPORT_SYMBOL(fw_iso_buffer_init);
 
-int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma)
+int fw_iso_buffer_map_vma(struct fw_iso_buffer *buffer,
+			  struct vm_area_struct *vma)
 {
 	unsigned long uaddr;
 	int i, err;
@@ -107,15 +128,18 @@ void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,
 	int i;
 	dma_addr_t address;
 
-	for (i = 0; i < buffer->page_count; i++) {
+	for (i = 0; i < buffer->page_count_mapped; i++) {
 		address = page_private(buffer->pages[i]);
 		dma_unmap_page(card->device, address,
 			       PAGE_SIZE, buffer->direction);
-		__free_page(buffer->pages[i]);
 	}
+	for (i = 0; i < buffer->page_count; i++)
+		__free_page(buffer->pages[i]);
 
 	kfree(buffer->pages);
 	buffer->pages = NULL;
+	buffer->page_count = 0;
+	buffer->page_count_mapped = 0;
 }
 EXPORT_SYMBOL(fw_iso_buffer_destroy);
 
diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index db8a965..780708d 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -1003,6 +1003,32 @@ void fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
 }
 EXPORT_SYMBOL(fw_core_handle_response);
 
+/**
+ * fw_rcode_string - convert a firewire result code to an error description
+ * @rcode: the result code
+ */
+const char *fw_rcode_string(int rcode)
+{
+	static const char *const names[] = {
+		[RCODE_COMPLETE]       = "no error",
+		[RCODE_CONFLICT_ERROR] = "conflict error",
+		[RCODE_DATA_ERROR]     = "data error",
+		[RCODE_TYPE_ERROR]     = "type error",
+		[RCODE_ADDRESS_ERROR]  = "address error",
+		[RCODE_SEND_ERROR]     = "send error",
+		[RCODE_CANCELLED]      = "timeout",
+		[RCODE_BUSY]           = "busy",
+		[RCODE_GENERATION]     = "bus reset",
+		[RCODE_NO_ACK]         = "no ack",
+	};
+
+	if ((unsigned int)rcode < ARRAY_SIZE(names) && names[rcode])
+		return names[rcode];
+	else
+		return "unknown";
+}
+EXPORT_SYMBOL(fw_rcode_string);
+
 static const struct fw_address_region topology_map_region =
 	{ .start = CSR_REGISTER_BASE | CSR_TOPOLOGY_MAP,
 	  .end   = CSR_REGISTER_BASE | CSR_TOPOLOGY_MAP_END, };
diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h
index b5a2f61..515a42c 100644
--- a/drivers/firewire/core.h
+++ b/drivers/firewire/core.h
@@ -3,6 +3,7 @@
 
 #include <linux/compiler.h>
 #include <linux/device.h>
+#include <linux/dma-mapping.h>
 #include <linux/fs.h>
 #include <linux/list.h>
 #include <linux/idr.h>
@@ -154,7 +155,11 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event);
 
 /* -iso */
 
-int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma);
+int fw_iso_buffer_alloc(struct fw_iso_buffer *buffer, int page_count);
+int fw_iso_buffer_map_dma(struct fw_iso_buffer *buffer, struct fw_card *card,
+			  enum dma_data_direction direction);
+int fw_iso_buffer_map_vma(struct fw_iso_buffer *buffer,
+			  struct vm_area_struct *vma);
 
 
 /* -topology */
diff --git a/drivers/firewire/nosy.c b/drivers/firewire/nosy.c
index a7c4422..4ebfb22 100644
--- a/drivers/firewire/nosy.c
+++ b/drivers/firewire/nosy.c
@@ -693,6 +693,8 @@ static struct pci_device_id pci_table[] __devinitdata = {
 	{ }	/* Terminating entry */
 };
 
+MODULE_DEVICE_TABLE(pci, pci_table);
+
 static struct pci_driver lynx_pci_driver = {
 	.name =		driver_name,
 	.id_table =	pci_table,
@@ -700,22 +702,8 @@ static struct pci_driver lynx_pci_driver = {
 	.remove =	remove_card,
 };
 
+module_pci_driver(lynx_pci_driver);
+
 MODULE_AUTHOR("Kristian Hoegsberg");
 MODULE_DESCRIPTION("Snoop mode driver for TI pcilynx 1394 controllers");
 MODULE_LICENSE("GPL");
-MODULE_DEVICE_TABLE(pci, pci_table);
-
-static int __init nosy_init(void)
-{
-	return pci_register_driver(&lynx_pci_driver);
-}
-
-static void __exit nosy_cleanup(void)
-{
-	pci_unregister_driver(&lynx_pci_driver);
-
-	pr_info("Unloaded %s\n", driver_name);
-}
-
-module_init(nosy_init);
-module_exit(nosy_cleanup);
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 2b54600..c1af05e 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -1821,9 +1821,8 @@ static void bus_reset_work(struct work_struct *work)
 {
 	struct fw_ohci *ohci =
 		container_of(work, struct fw_ohci, bus_reset_work);
-	int self_id_count, i, j, reg;
-	int generation, new_generation;
-	unsigned long flags;
+	int self_id_count, generation, new_generation, i, j;
+	u32 reg;
 	void *free_rom = NULL;
 	dma_addr_t free_rom_bus = 0;
 	bool is_new_root;
@@ -1930,13 +1929,13 @@ static void bus_reset_work(struct work_struct *work)
 	}
 
 	/* FIXME: Document how the locking works. */
-	spin_lock_irqsave(&ohci->lock, flags);
+	spin_lock_irq(&ohci->lock);
 
 	ohci->generation = -1; /* prevent AT packet queueing */
 	context_stop(&ohci->at_request_ctx);
 	context_stop(&ohci->at_response_ctx);
 
-	spin_unlock_irqrestore(&ohci->lock, flags);
+	spin_unlock_irq(&ohci->lock);
 
 	/*
 	 * Per OHCI 1.2 draft, clause 7.2.3.3, hardware may leave unsent
@@ -1946,7 +1945,7 @@ static void bus_reset_work(struct work_struct *work)
 	at_context_flush(&ohci->at_request_ctx);
 	at_context_flush(&ohci->at_response_ctx);
 
-	spin_lock_irqsave(&ohci->lock, flags);
+	spin_lock_irq(&ohci->lock);
 
 	ohci->generation = generation;
 	reg_write(ohci, OHCI1394_IntEventClear, OHCI1394_busReset);
@@ -1990,7 +1989,7 @@ static void bus_reset_work(struct work_struct *work)
 	reg_write(ohci, OHCI1394_PhyReqFilterLoSet, ~0);
 #endif
 
-	spin_unlock_irqrestore(&ohci->lock, flags);
+	spin_unlock_irq(&ohci->lock);
 
 	if (free_rom)
 		dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
@@ -2402,7 +2401,6 @@ static int ohci_set_config_rom(struct fw_card *card,
 			       const __be32 *config_rom, size_t length)
 {
 	struct fw_ohci *ohci;
-	unsigned long flags;
 	__be32 *next_config_rom;
 	dma_addr_t uninitialized_var(next_config_rom_bus);
 
@@ -2441,7 +2439,7 @@ static int ohci_set_config_rom(struct fw_card *card,
 	if (next_config_rom == NULL)
 		return -ENOMEM;
 
-	spin_lock_irqsave(&ohci->lock, flags);
+	spin_lock_irq(&ohci->lock);
 
 	/*
 	 * If there is not an already pending config_rom update,
@@ -2467,7 +2465,7 @@ static int ohci_set_config_rom(struct fw_card *card,
 
 	reg_write(ohci, OHCI1394_ConfigROMmap, ohci->next_config_rom_bus);
 
-	spin_unlock_irqrestore(&ohci->lock, flags);
+	spin_unlock_irq(&ohci->lock);
 
 	/* If we didn't use the DMA allocation, delete it. */
 	if (next_config_rom != NULL)
@@ -2891,10 +2889,9 @@ static struct fw_iso_context *ohci_allocate_iso_context(struct fw_card *card,
 	descriptor_callback_t uninitialized_var(callback);
 	u64 *uninitialized_var(channels);
 	u32 *uninitialized_var(mask), uninitialized_var(regs);
-	unsigned long flags;
 	int index, ret = -EBUSY;
 
-	spin_lock_irqsave(&ohci->lock, flags);
+	spin_lock_irq(&ohci->lock);
 
 	switch (type) {
 	case FW_ISO_CONTEXT_TRANSMIT:
@@ -2938,7 +2935,7 @@ static struct fw_iso_context *ohci_allocate_iso_context(struct fw_card *card,
 		ret = -ENOSYS;
 	}
 
-	spin_unlock_irqrestore(&ohci->lock, flags);
+	spin_unlock_irq(&ohci->lock);
 
 	if (index < 0)
 		return ERR_PTR(ret);
@@ -2964,7 +2961,7 @@ static struct fw_iso_context *ohci_allocate_iso_context(struct fw_card *card,
  out_with_header:
 	free_page((unsigned long)ctx->header);
  out:
-	spin_lock_irqsave(&ohci->lock, flags);
+	spin_lock_irq(&ohci->lock);
 
 	switch (type) {
 	case FW_ISO_CONTEXT_RECEIVE:
@@ -2977,7 +2974,7 @@ static struct fw_iso_context *ohci_allocate_iso_context(struct fw_card *card,
 	}
 	*mask |= 1 << index;
 
-	spin_unlock_irqrestore(&ohci->lock, flags);
+	spin_unlock_irq(&ohci->lock);
 
 	return ERR_PTR(ret);
 }
@@ -3789,6 +3786,8 @@ static struct pci_driver fw_ohci_pci_driver = {
 #endif
 };
 
+module_pci_driver(fw_ohci_pci_driver);
+
 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
 MODULE_DESCRIPTION("Driver for PCI OHCI IEEE1394 controllers");
 MODULE_LICENSE("GPL");
@@ -3797,16 +3796,3 @@ MODULE_LICENSE("GPL");
 #ifndef CONFIG_IEEE1394_OHCI1394_MODULE
 MODULE_ALIAS("ohci1394");
 #endif
-
-static int __init fw_ohci_init(void)
-{
-	return pci_register_driver(&fw_ohci_pci_driver);
-}
-
-static void __exit fw_ohci_cleanup(void)
-{
-	pci_unregister_driver(&fw_ohci_pci_driver);
-}
-
-module_init(fw_ohci_init);
-module_exit(fw_ohci_cleanup);
diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c
index b7e65d7..1162d6b 100644
--- a/drivers/firewire/sbp2.c
+++ b/drivers/firewire/sbp2.c
@@ -207,9 +207,8 @@ static const struct device *lu_dev(const struct sbp2_logical_unit *lu)
 #define SBP2_MAX_CDB_SIZE		16
 
 /*
- * 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.
+ * The maximum SBP-2 data buffer size is 0xffff.  We quadlet-align this
+ * for compatibility with earlier versions of this driver.
  */
 #define SBP2_MAX_SEG_SIZE		0xfffc
 
@@ -1163,7 +1162,8 @@ static int sbp2_probe(struct device *dev)
 
 	shost->max_cmd_len = SBP2_MAX_CDB_SIZE;
 
-	if (scsi_add_host(shost, &unit->device) < 0)
+	if (scsi_add_host_with_dma(shost, &unit->device,
+				   device->card->device) < 0)
 		goto fail_shost_put;
 
 	/* implicit directory ID */
@@ -1295,10 +1295,7 @@ static struct fw_driver sbp2_driver = {
 static void sbp2_unmap_scatterlist(struct device *card_device,
 				   struct sbp2_command_orb *orb)
 {
-	if (scsi_sg_count(orb->cmd))
-		dma_unmap_sg(card_device, scsi_sglist(orb->cmd),
-			     scsi_sg_count(orb->cmd),
-			     orb->cmd->sc_data_direction);
+	scsi_dma_unmap(orb->cmd);
 
 	if (orb->request.misc & cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT))
 		dma_unmap_single(card_device, orb->page_table_bus,
@@ -1404,9 +1401,8 @@ static int sbp2_map_scatterlist(struct sbp2_command_orb *orb,
 	struct scatterlist *sg = scsi_sglist(orb->cmd);
 	int i, n;
 
-	n = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
-		       orb->cmd->sc_data_direction);
-	if (n == 0)
+	n = scsi_dma_map(orb->cmd);
+	if (n <= 0)
 		goto fail;
 
 	/*
@@ -1452,8 +1448,7 @@ static int sbp2_map_scatterlist(struct sbp2_command_orb *orb,
 	return 0;
 
  fail_page_table:
-	dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd),
-		     scsi_sg_count(orb->cmd), orb->cmd->sc_data_direction);
+	scsi_dma_unmap(orb->cmd);
  fail:
 	return -ENOMEM;
 }
@@ -1534,7 +1529,10 @@ static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
 
 	sdev->allow_restart = 1;
 
-	/* SBP-2 requires quadlet alignment of the data buffers. */
+	/*
+	 * SBP-2 does not require any alignment, but we set it anyway
+	 * for compatibility with earlier versions of this driver.
+	 */
 	blk_queue_update_dma_alignment(sdev->request_queue, 4 - 1);
 
 	if (lu->tgt->workarounds & SBP2_WORKAROUND_INQUIRY_36)
@@ -1568,8 +1566,6 @@ static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
 	if (lu->tgt->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS)
 		blk_queue_max_hw_sectors(sdev->request_queue, 128 * 1024 / 512);
 
-	blk_queue_max_segment_size(sdev->request_queue, SBP2_MAX_SEG_SIZE);
-
 	return 0;
 }
 
diff --git a/include/linux/firewire.h b/include/linux/firewire.h
index e83c24a..7edcf10 100644
--- a/include/linux/firewire.h
+++ b/include/linux/firewire.h
@@ -349,6 +349,7 @@ int fw_cancel_transaction(struct fw_card *card,
 int fw_run_transaction(struct fw_card *card, int tcode, int destination_id,
 		       int generation, int speed, unsigned long long offset,
 		       void *payload, size_t length);
+const char *fw_rcode_string(int rcode);
 
 static inline int fw_stream_packet_destination_id(int tag, int channel, int sy)
 {
@@ -406,6 +407,7 @@ struct fw_iso_buffer {
 	enum dma_data_direction direction;
 	struct page **pages;
 	int page_count;
+	int page_count_mapped;
 };
 
 int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
diff --git a/sound/firewire/cmp.c b/sound/firewire/cmp.c
index 76294f2..645cb0b 100644
--- a/sound/firewire/cmp.c
+++ b/sound/firewire/cmp.c
@@ -84,7 +84,7 @@ static int pcr_modify(struct cmp_connection *c,
 	return 0;
 
 io_error:
-	cmp_error(c, "transaction failed: %s\n", rcode_string(rcode));
+	cmp_error(c, "transaction failed: %s\n", fw_rcode_string(rcode));
 	return -EIO;
 
 bus_reset:
diff --git a/sound/firewire/lib.c b/sound/firewire/lib.c
index 4750cea..14eb414 100644
--- a/sound/firewire/lib.c
+++ b/sound/firewire/lib.c
@@ -14,32 +14,6 @@
 #define ERROR_RETRY_DELAY_MS	5
 
 /**
- * rcode_string - convert a firewire result code to a string
- * @rcode: the result
- */
-const char *rcode_string(unsigned int rcode)
-{
-	static const char *const names[] = {
-		[RCODE_COMPLETE]	= "complete",
-		[RCODE_CONFLICT_ERROR]	= "conflict error",
-		[RCODE_DATA_ERROR]	= "data error",
-		[RCODE_TYPE_ERROR]	= "type error",
-		[RCODE_ADDRESS_ERROR]	= "address error",
-		[RCODE_SEND_ERROR]	= "send error",
-		[RCODE_CANCELLED]	= "cancelled",
-		[RCODE_BUSY]		= "busy",
-		[RCODE_GENERATION]	= "generation",
-		[RCODE_NO_ACK]		= "no ack",
-	};
-
-	if (rcode < ARRAY_SIZE(names) && names[rcode])
-		return names[rcode];
-	else
-		return "unknown";
-}
-EXPORT_SYMBOL(rcode_string);
-
-/**
  * snd_fw_transaction - send a request and wait for its completion
  * @unit: the driver's unit on the target device
  * @tcode: the transaction code
@@ -71,7 +45,7 @@ int snd_fw_transaction(struct fw_unit *unit, int tcode,
 
 		if (rcode_is_permanent_error(rcode) || ++tries >= 3) {
 			dev_err(&unit->device, "transaction failed: %s\n",
-				rcode_string(rcode));
+				fw_rcode_string(rcode));
 			return -EIO;
 		}
 
diff --git a/sound/firewire/lib.h b/sound/firewire/lib.h
index 064f3fd..aef3014 100644
--- a/sound/firewire/lib.h
+++ b/sound/firewire/lib.h
@@ -8,7 +8,6 @@ struct fw_unit;
 
 int snd_fw_transaction(struct fw_unit *unit, int tcode,
 		       u64 offset, void *buffer, size_t length);
-const char *rcode_string(unsigned int rcode);
 
 /* returns true if retrying the transaction would not make sense */
 static inline bool rcode_is_permanent_error(int rcode)