Merge branch 'for-2.6.25' of master.kernel.org:/pub/scm/linux/kernel/git/arnd/cell-2.6 into merge

7 files changed, 413 insertions, 147 deletions

diff --git a/drivers/firewire/fw-card.c b/drivers/firewire/fw-card.c
index 3e9719948a8e..a03462750b95 100644
--- a/drivers/firewire/fw-card.c
+++ b/drivers/firewire/fw-card.c
@@ -18,6 +18,7 @@
 
 #include <linux/module.h>
 #include <linux/errno.h>
+#include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/mutex.h>
 #include <linux/crc-itu-t.h>
@@ -214,17 +215,29 @@ 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;
+        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 do_reset = 0;
 
         spin_lock_irqsave(&card->lock, flags);
+        local_node = card->local_node;
+        root_node  = card->root_node;
+
+        if (local_node == NULL) {
+                spin_unlock_irqrestore(&card->lock, flags);
+                return;
+        }
+        fw_node_get(local_node);
+        fw_node_get(root_node);
 
         generation = card->generation;
-        root = card->root_node->data;
-        root_id = card->root_node->node_id;
+        root_device = root_node->data;
+        if (root_device)
+                fw_device_get(root_device);
+        root_id = root_node->node_id;
         grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 10));
 
         if (card->bm_generation + 1 == generation ||
@@ -243,14 +256,14 @@ fw_card_bm_work(struct work_struct *work)
 
                 irm_id = card->irm_node->node_id;
                 if (!card->irm_node->link_on) {
-                        new_root_id = card->local_node->node_id;
+                        new_root_id = local_node->node_id;
                         fw_notify("IRM has link off, making local node (%02x) root.\n",
                                   new_root_id);
                         goto pick_me;
                 }
 
                 bmd.lock.arg = cpu_to_be32(0x3f);
-                bmd.lock.data = cpu_to_be32(card->local_node->node_id);
+                bmd.lock.data = cpu_to_be32(local_node->node_id);
 
                 spin_unlock_irqrestore(&card->lock, flags);
 
@@ -267,12 +280,12 @@ fw_card_bm_work(struct work_struct *work)
                          * Another bus reset happened. Just return,
                          * the BM work has been rescheduled.
                          */
-                        return;
+                        goto out;
                 }
 
                 if (bmd.rcode == RCODE_COMPLETE && bmd.old != 0x3f)
                         /* Somebody else is BM, let them do the work. */
-                        return;
+                        goto out;
 
                 spin_lock_irqsave(&card->lock, flags);
                 if (bmd.rcode != RCODE_COMPLETE) {
@@ -282,7 +295,7 @@ fw_card_bm_work(struct work_struct *work)
                          * do a bus reset and pick the local node as
                          * root, and thus, IRM.
                          */
-                        new_root_id = card->local_node->node_id;
+                        new_root_id = local_node->node_id;
                         fw_notify("BM lock failed, making local node (%02x) root.\n",
                                   new_root_id);
                         goto pick_me;
@@ -295,7 +308,7 @@ fw_card_bm_work(struct work_struct *work)
                  */
                 spin_unlock_irqrestore(&card->lock, flags);
                 schedule_delayed_work(&card->work, DIV_ROUND_UP(HZ, 10));
-                return;
+                goto out;
         }
 
         /*
@@ -305,20 +318,20 @@ fw_card_bm_work(struct work_struct *work)
          */
         card->bm_generation = generation;
 
-        if (root == NULL) {
+        if (root_device == NULL) {
                 /*
                  * Either link_on is false, or we failed to read the
                  * config rom.  In either case, pick another root.
                  */
-                new_root_id = card->local_node->node_id;
-        } else if (atomic_read(&root->state) != FW_DEVICE_RUNNING) {
+                new_root_id = local_node->node_id;
+        } else if (atomic_read(&root_device->state) != FW_DEVICE_RUNNING) {
                 /*
                  * If we haven't probed this device yet, bail out now
                  * and let's try again once that's done.
                  */
                 spin_unlock_irqrestore(&card->lock, flags);
-                return;
-        } else if (root->config_rom[2] & BIB_CMC) {
+                goto out;
+        } else if (root_device->config_rom[2] & BIB_CMC) {
                 /*
                  * FIXME: I suppose we should set the cmstr bit in the
                  * STATE_CLEAR register of this node, as described in
@@ -332,7 +345,7 @@ fw_card_bm_work(struct work_struct *work)
                  * successfully read the config rom, but it's not
                  * cycle master capable.
                  */
-                new_root_id = card->local_node->node_id;
+                new_root_id = local_node->node_id;
         }
 
  pick_me:
@@ -341,8 +354,8 @@ fw_card_bm_work(struct work_struct *work)
          * the typically much larger 1394b beta repeater delays though.
          */
         if (!card->beta_repeaters_present &&
-            card->root_node->max_hops < ARRAY_SIZE(gap_count_table))
-                gap_count = gap_count_table[card->root_node->max_hops];
+            root_node->max_hops < ARRAY_SIZE(gap_count_table))
+                gap_count = gap_count_table[root_node->max_hops];
         else
                 gap_count = 63;
 
@@ -364,6 +377,11 @@ fw_card_bm_work(struct work_struct *work)
                 fw_send_phy_config(card, new_root_id, generation, gap_count);
                 fw_core_initiate_bus_reset(card, 1);
         }
+ out:
+        if (root_device)
+                fw_device_put(root_device);
+        fw_node_put(root_node);
+        fw_node_put(local_node);
 }
 
 static void
@@ -381,6 +399,7 @@ fw_card_initialize(struct fw_card *card, const struct fw_card_driver *driver,
         static atomic_t index = ATOMIC_INIT(-1);
 
         kref_init(&card->kref);
+        atomic_set(&card->device_count, 0);
         card->index = atomic_inc_return(&index);
         card->driver = driver;
         card->device = device;
@@ -511,8 +530,14 @@ fw_core_remove_card(struct fw_card *card)
         card->driver = &dummy_driver;
 
         fw_destroy_nodes(card);
-        flush_scheduled_work();
+        /*
+         * Wait for all device workqueue jobs to finish.  Otherwise the
+         * firewire-core module could be unloaded before the jobs ran.
+         */
+        while (atomic_read(&card->device_count) > 0)
+                msleep(100);
 
+        cancel_delayed_work_sync(&card->work);
         fw_flush_transactions(card);
         del_timer_sync(&card->flush_timer);
 
diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
index 7e73cbaa4121..46bc197a047f 100644
--- a/drivers/firewire/fw-cdev.c
+++ b/drivers/firewire/fw-cdev.c
@@ -109,15 +109,17 @@ static int fw_device_op_open(struct inode *inode, struct file *file)
         struct client *client;
         unsigned long flags;
 
-        device = fw_device_from_devt(inode->i_rdev);
+        device = fw_device_get_by_devt(inode->i_rdev);
         if (device == NULL)
                 return -ENODEV;
 
         client = kzalloc(sizeof(*client), GFP_KERNEL);
-        if (client == NULL)
+        if (client == NULL) {
+                fw_device_put(device);
                 return -ENOMEM;
+        }
 
-        client->device = fw_device_get(device);
+        client->device = device;
         INIT_LIST_HEAD(&client->event_list);
         INIT_LIST_HEAD(&client->resource_list);
         spin_lock_init(&client->lock);
@@ -644,6 +646,10 @@ static int ioctl_create_iso_context(struct client *client, void *buffer)
         struct fw_cdev_create_iso_context *request = buffer;
         struct fw_iso_context *context;
 
+        /* We only support one context at this time. */
+        if (client->iso_context != NULL)
+                return -EBUSY;
+
         if (request->channel > 63)
                 return -EINVAL;
 
@@ -790,8 +796,9 @@ static int ioctl_start_iso(struct client *client, void *buffer)
 {
         struct fw_cdev_start_iso *request = buffer;
 
-        if (request->handle != 0)
+        if (client->iso_context == NULL || request->handle != 0)
                 return -EINVAL;
+
         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
                 if (request->tags == 0 || request->tags > 15)
                         return -EINVAL;
@@ -808,7 +815,7 @@ static int ioctl_stop_iso(struct client *client, void *buffer)
 {
         struct fw_cdev_stop_iso *request = buffer;
 
-        if (request->handle != 0)
+        if (client->iso_context == NULL || request->handle != 0)
                 return -EINVAL;
 
         return fw_iso_context_stop(client->iso_context);
diff --git a/drivers/firewire/fw-device.c b/drivers/firewire/fw-device.c
index de9066e69adf..870125a3638e 100644
--- a/drivers/firewire/fw-device.c
+++ b/drivers/firewire/fw-device.c
@@ -150,21 +150,10 @@ struct bus_type fw_bus_type = {
 };
 EXPORT_SYMBOL(fw_bus_type);
 
-struct fw_device *fw_device_get(struct fw_device *device)
-{
-        get_device(&device->device);
-
-        return device;
-}
-
-void fw_device_put(struct fw_device *device)
-{
-        put_device(&device->device);
-}
-
 static void fw_device_release(struct device *dev)
 {
         struct fw_device *device = fw_device(dev);
+        struct fw_card *card = device->card;
         unsigned long flags;
 
         /*
@@ -176,9 +165,9 @@ static void fw_device_release(struct device *dev)
         spin_unlock_irqrestore(&device->card->lock, flags);
 
         fw_node_put(device->node);
-        fw_card_put(device->card);
         kfree(device->config_rom);
         kfree(device);
+        atomic_dec(&card->device_count);
 }
 
 int fw_device_enable_phys_dma(struct fw_device *device)
@@ -358,12 +347,9 @@ static ssize_t
 guid_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
         struct fw_device *device = fw_device(dev);
-        u64 guid;
-
-        guid = ((u64)device->config_rom[3] << 32) | device->config_rom[4];
 
-        return snprintf(buf, PAGE_SIZE, "0x%016llx\n",
-                        (unsigned long long)guid);
+        return snprintf(buf, PAGE_SIZE, "0x%08x%08x\n",
+                        device->config_rom[3], device->config_rom[4]);
 }
 
 static struct device_attribute fw_device_attributes[] = {
@@ -610,12 +596,14 @@ static DECLARE_RWSEM(idr_rwsem);
 static DEFINE_IDR(fw_device_idr);
 int fw_cdev_major;
 
-struct fw_device *fw_device_from_devt(dev_t devt)
+struct fw_device *fw_device_get_by_devt(dev_t devt)
 {
         struct fw_device *device;
 
         down_read(&idr_rwsem);
         device = idr_find(&fw_device_idr, MINOR(devt));
+        if (device)
+                fw_device_get(device);
         up_read(&idr_rwsem);
 
         return device;
@@ -627,13 +615,14 @@ static void fw_device_shutdown(struct work_struct *work)
                 container_of(work, struct fw_device, work.work);
         int minor = MINOR(device->device.devt);
 
-        down_write(&idr_rwsem);
-        idr_remove(&fw_device_idr, minor);
-        up_write(&idr_rwsem);
-
         fw_device_cdev_remove(device);
         device_for_each_child(&device->device, NULL, shutdown_unit);
         device_unregister(&device->device);
+
+        down_write(&idr_rwsem);
+        idr_remove(&fw_device_idr, minor);
+        up_write(&idr_rwsem);
+        fw_device_put(device);
 }
 
 static struct device_type fw_device_type = {
@@ -668,7 +657,8 @@ static void fw_device_init(struct work_struct *work)
          */
 
         if (read_bus_info_block(device, device->generation) < 0) {
-                if (device->config_rom_retries < MAX_RETRIES) {
+                if (device->config_rom_retries < MAX_RETRIES &&
+                    atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
                         device->config_rom_retries++;
                         schedule_delayed_work(&device->work, RETRY_DELAY);
                 } else {
@@ -682,10 +672,13 @@ static void fw_device_init(struct work_struct *work)
         }
 
         err = -ENOMEM;
+
+        fw_device_get(device);
         down_write(&idr_rwsem);
         if (idr_pre_get(&fw_device_idr, GFP_KERNEL))
                 err = idr_get_new(&fw_device_idr, device, &minor);
         up_write(&idr_rwsem);
+
         if (err < 0)
                 goto error;
 
@@ -717,13 +710,22 @@ static void fw_device_init(struct work_struct *work)
          */
         if (atomic_cmpxchg(&device->state,
                     FW_DEVICE_INITIALIZING,
-                    FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN)
+                    FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) {
                 fw_device_shutdown(&device->work.work);
-        else
-                fw_notify("created new fw device %s "
-                          "(%d config rom retries, S%d00)\n",
-                          device->device.bus_id, device->config_rom_retries,
-                          1 << device->max_speed);
+        } else {
+                if (device->config_rom_retries)
+                        fw_notify("created device %s: GUID %08x%08x, S%d00, "
+                                  "%d config ROM retries\n",
+                                  device->device.bus_id,
+                                  device->config_rom[3], device->config_rom[4],
+                                  1 << device->max_speed,
+                                  device->config_rom_retries);
+                else
+                        fw_notify("created device %s: GUID %08x%08x, S%d00\n",
+                                  device->device.bus_id,
+                                  device->config_rom[3], device->config_rom[4],
+                                  1 << device->max_speed);
+        }
 
         /*
          * Reschedule the IRM work if we just finished reading the
@@ -741,7 +743,9 @@ static void fw_device_init(struct work_struct *work)
         idr_remove(&fw_device_idr, minor);
         up_write(&idr_rwsem);
  error:
-        put_device(&device->device);
+        fw_device_put(device);          /* fw_device_idr's reference */
+
+        put_device(&device->device);    /* our reference */
 }
 
 static int update_unit(struct device *dev, void *data)
@@ -791,7 +795,8 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
                  */
                 device_initialize(&device->device);
                 atomic_set(&device->state, FW_DEVICE_INITIALIZING);
-                device->card = fw_card_get(card);
+                atomic_inc(&card->device_count);
+                device->card = card;
                 device->node = fw_node_get(node);
                 device->node_id = node->node_id;
                 device->generation = card->generation;
diff --git a/drivers/firewire/fw-device.h b/drivers/firewire/fw-device.h
index 0854fe2bc110..78ecd3991b7f 100644
--- a/drivers/firewire/fw-device.h
+++ b/drivers/firewire/fw-device.h
@@ -76,14 +76,26 @@ fw_device_is_shutdown(struct fw_device *device)
         return atomic_read(&device->state) == FW_DEVICE_SHUTDOWN;
 }
 
-struct fw_device *fw_device_get(struct fw_device *device);
-void fw_device_put(struct fw_device *device);
+static inline struct fw_device *
+fw_device_get(struct fw_device *device)
+{
+        get_device(&device->device);
+
+        return device;
+}
+
+static inline void
+fw_device_put(struct fw_device *device)
+{
+        put_device(&device->device);
+}
+
+struct fw_device *fw_device_get_by_devt(dev_t devt);
 int fw_device_enable_phys_dma(struct fw_device *device);
 
 void fw_device_cdev_update(struct fw_device *device);
 void fw_device_cdev_remove(struct fw_device *device);
 
-struct fw_device *fw_device_from_devt(dev_t devt);
 extern int fw_cdev_major;
 
 struct fw_unit {
diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c
index 19ece9b6d742..03069a454c07 100644
--- a/drivers/firewire/fw-sbp2.c
+++ b/drivers/firewire/fw-sbp2.c
@@ -28,14 +28,15 @@
  * and many others.
  */
 
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
 #include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
-#include <linux/mod_devicetable.h>
-#include <linux/device.h>
 #include <linux/scatterlist.h>
-#include <linux/dma-mapping.h>
-#include <linux/blkdev.h>
 #include <linux/string.h>
 #include <linux/stringify.h>
 #include <linux/timer.h>
@@ -47,9 +48,9 @@
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_host.h>
 
-#include "fw-transaction.h"
-#include "fw-topology.h"
 #include "fw-device.h"
+#include "fw-topology.h"
+#include "fw-transaction.h"
 
 /*
  * So far only bridges from Oxford Semiconductor are known to support
@@ -82,6 +83,9 @@ MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device "
  *   Avoids access beyond actual disk limits on devices with an off-by-one bug.
  *   Don't use this with devices which don't have this bug.
  *
+ * - delay inquiry
+ *   Wait extra SBP2_INQUIRY_DELAY seconds after login before SCSI inquiry.
+ *
  * - override internal blacklist
  *   Instead of adding to the built-in blacklist, use only the workarounds
  *   specified in the module load parameter.
@@ -91,6 +95,8 @@ MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device "
 #define SBP2_WORKAROUND_INQUIRY_36      0x2
 #define SBP2_WORKAROUND_MODE_SENSE_8    0x4
 #define SBP2_WORKAROUND_FIX_CAPACITY    0x8
+#define SBP2_WORKAROUND_DELAY_INQUIRY   0x10
+#define SBP2_INQUIRY_DELAY              12
 #define SBP2_WORKAROUND_OVERRIDE        0x100
 
 static int sbp2_param_workarounds;
@@ -100,6 +106,7 @@ MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0"
         ", 36 byte inquiry = "    __stringify(SBP2_WORKAROUND_INQUIRY_36)
         ", skip mode page 8 = "   __stringify(SBP2_WORKAROUND_MODE_SENSE_8)
         ", fix capacity = "       __stringify(SBP2_WORKAROUND_FIX_CAPACITY)
+        ", delay inquiry = "      __stringify(SBP2_WORKAROUND_DELAY_INQUIRY)
         ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE)
         ", or a combination)");
 
@@ -115,7 +122,6 @@ static const char sbp2_driver_name[] = "sbp2";
 struct sbp2_logical_unit {
         struct sbp2_target *tgt;
         struct list_head link;
-        struct scsi_device *sdev;
         struct fw_address_handler address_handler;
         struct list_head orb_list;
 
@@ -132,6 +138,8 @@ struct sbp2_logical_unit {
         int generation;
         int retries;
         struct delayed_work work;
+        bool has_sdev;
+        bool blocked;
 };
 
 /*
@@ -141,16 +149,18 @@ struct sbp2_logical_unit {
 struct sbp2_target {
         struct kref kref;
         struct fw_unit *unit;
+        const char *bus_id;
+        struct list_head lu_list;
 
         u64 management_agent_address;
         int directory_id;
         int node_id;
         int address_high;
-
-        unsigned workarounds;
-        struct list_head lu_list;
-
+        unsigned int workarounds;
         unsigned int mgt_orb_timeout;
+
+        int dont_block; /* counter for each logical unit */
+        int blocked;    /* ditto */
 };
 
 /*
@@ -160,7 +170,7 @@ struct sbp2_target {
  */
 #define SBP2_MIN_LOGIN_ORB_TIMEOUT      5000U   /* Timeout in ms */
 #define SBP2_MAX_LOGIN_ORB_TIMEOUT      40000U  /* Timeout in ms */
-#define SBP2_ORB_TIMEOUT                2000    /* Timeout in ms */
+#define SBP2_ORB_TIMEOUT                2000U   /* Timeout in ms */
 #define SBP2_ORB_NULL                   0x80000000
 #define SBP2_MAX_SG_ELEMENT_LENGTH      0xf000
 
@@ -297,7 +307,7 @@ struct sbp2_command_orb {
 static const struct {
         u32 firmware_revision;
         u32 model;
-        unsigned workarounds;
+        unsigned int workarounds;
 } sbp2_workarounds_table[] = {
         /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
                 .firmware_revision      = 0x002800,
@@ -305,6 +315,11 @@ static const struct {
                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36 |
                                           SBP2_WORKAROUND_MODE_SENSE_8,
         },
+        /* DViCO Momobay FX-3A with TSB42AA9A bridge */ {
+                .firmware_revision      = 0x002800,
+                .model                  = 0x000000,
+                .workarounds            = SBP2_WORKAROUND_DELAY_INQUIRY,
+        },
         /* Initio bridges, actually only needed for some older ones */ {
                 .firmware_revision      = 0x000200,
                 .model                  = ~0,
@@ -501,6 +516,9 @@ sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id,
         unsigned int timeout;
         int retval = -ENOMEM;
 
+        if (function == SBP2_LOGOUT_REQUEST && fw_device_is_shutdown(device))
+                return 0;
+
         orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
         if (orb == NULL)
                 return -ENOMEM;
@@ -553,20 +571,20 @@ sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id,
 
         retval = -EIO;
         if (sbp2_cancel_orbs(lu) == 0) {
-                fw_error("orb reply timed out, rcode=0x%02x\n",
-                         orb->base.rcode);
+                fw_error("%s: orb reply timed out, rcode=0x%02x\n",
+                         lu->tgt->bus_id, orb->base.rcode);
                 goto out;
         }
 
         if (orb->base.rcode != RCODE_COMPLETE) {
-                fw_error("management write failed, rcode 0x%02x\n",
-                         orb->base.rcode);
+                fw_error("%s: management write failed, rcode 0x%02x\n",
+                         lu->tgt->bus_id, orb->base.rcode);
                 goto out;
         }
 
         if (STATUS_GET_RESPONSE(orb->status) != 0 ||
             STATUS_GET_SBP_STATUS(orb->status) != 0) {
-                fw_error("error status: %d:%d\n",
+                fw_error("%s: error status: %d:%d\n", lu->tgt->bus_id,
                          STATUS_GET_RESPONSE(orb->status),
                          STATUS_GET_SBP_STATUS(orb->status));
                 goto out;
@@ -590,29 +608,158 @@ sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id,
 
 static void
 complete_agent_reset_write(struct fw_card *card, int rcode,
-                           void *payload, size_t length, void *data)
+                           void *payload, size_t length, void *done)
 {
-        struct fw_transaction *t = data;
+        complete(done);
+}
 
-        kfree(t);
+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;
+
+        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, &done);
+        wait_for_completion(&done);
+}
+
+static void
+complete_agent_reset_write_no_wait(struct fw_card *card, int rcode,
+                                   void *payload, size_t length, void *data)
+{
+        kfree(data);
 }
 
-static int sbp2_agent_reset(struct sbp2_logical_unit *lu)
+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 zero;
+        static u32 z;
 
-        t = kzalloc(sizeof(*t), GFP_ATOMIC);
+        t = kmalloc(sizeof(*t), GFP_ATOMIC);
         if (t == NULL)
-                return -ENOMEM;
+                return;
 
         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,
-                        &zero, sizeof(zero), complete_agent_reset_write, t);
+                        &z, sizeof(z), complete_agent_reset_write_no_wait, t);
+}
 
-        return 0;
+static void sbp2_set_generation(struct sbp2_logical_unit *lu, int generation)
+{
+        struct fw_card *card = fw_device(lu->tgt->unit->device.parent)->card;
+        unsigned long flags;
+
+        /* serialize with comparisons of lu->generation and card->generation */
+        spin_lock_irqsave(&card->lock, flags);
+        lu->generation = generation;
+        spin_unlock_irqrestore(&card->lock, flags);
+}
+
+static inline void sbp2_allow_block(struct sbp2_logical_unit *lu)
+{
+        /*
+         * We may access dont_block without taking card->lock here:
+         * All callers of sbp2_allow_block() and all callers of sbp2_unblock()
+         * are currently serialized against each other.
+         * And a wrong result in sbp2_conditionally_block()'s access of
+         * dont_block is rather harmless, it simply misses its first chance.
+         */
+        --lu->tgt->dont_block;
+}
+
+/*
+ * Blocks lu->tgt if all of the following conditions are met:
+ *   - Login, INQUIRY, and high-level SCSI setup of all of the target's
+ *     logical units have been finished (indicated by dont_block == 0).
+ *   - lu->generation is stale.
+ *
+ * Note, scsi_block_requests() must be called while holding card->lock,
+ * otherwise it might foil sbp2_[conditionally_]unblock()'s attempt to
+ * unblock the target.
+ */
+static void sbp2_conditionally_block(struct sbp2_logical_unit *lu)
+{
+        struct sbp2_target *tgt = lu->tgt;
+        struct fw_card *card = fw_device(tgt->unit->device.parent)->card;
+        struct Scsi_Host *shost =
+                container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
+        unsigned long flags;
+
+        spin_lock_irqsave(&card->lock, flags);
+        if (!tgt->dont_block && !lu->blocked &&
+            lu->generation != card->generation) {
+                lu->blocked = true;
+                if (++tgt->blocked == 1) {
+                        scsi_block_requests(shost);
+                        fw_notify("blocked %s\n", lu->tgt->bus_id);
+                }
+        }
+        spin_unlock_irqrestore(&card->lock, flags);
+}
+
+/*
+ * Unblocks lu->tgt as soon as all its logical units can be unblocked.
+ * Note, it is harmless to run scsi_unblock_requests() outside the
+ * card->lock protected section.  On the other hand, running it inside
+ * the section might clash with shost->host_lock.
+ */
+static void sbp2_conditionally_unblock(struct sbp2_logical_unit *lu)
+{
+        struct sbp2_target *tgt = lu->tgt;
+        struct fw_card *card = fw_device(tgt->unit->device.parent)->card;
+        struct Scsi_Host *shost =
+                container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
+        unsigned long flags;
+        bool unblock = false;
+
+        spin_lock_irqsave(&card->lock, flags);
+        if (lu->blocked && lu->generation == card->generation) {
+                lu->blocked = false;
+                unblock = --tgt->blocked == 0;
+        }
+        spin_unlock_irqrestore(&card->lock, flags);
+
+        if (unblock) {
+                scsi_unblock_requests(shost);
+                fw_notify("unblocked %s\n", lu->tgt->bus_id);
+        }
+}
+
+/*
+ * Prevents future blocking of tgt and unblocks it.
+ * Note, it is harmless to run scsi_unblock_requests() outside the
+ * card->lock protected section.  On the other hand, running it inside
+ * the section might clash with shost->host_lock.
+ */
+static void sbp2_unblock(struct sbp2_target *tgt)
+{
+        struct fw_card *card = fw_device(tgt->unit->device.parent)->card;
+        struct Scsi_Host *shost =
+                container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
+        unsigned long flags;
+
+        spin_lock_irqsave(&card->lock, flags);
+        ++tgt->dont_block;
+        spin_unlock_irqrestore(&card->lock, flags);
+
+        scsi_unblock_requests(shost);
+}
+
+static int sbp2_lun2int(u16 lun)
+{
+        struct scsi_lun eight_bytes_lun;
+
+        memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun));
+        eight_bytes_lun.scsi_lun[0] = (lun >> 8) & 0xff;
+        eight_bytes_lun.scsi_lun[1] = lun & 0xff;
+
+        return scsilun_to_int(&eight_bytes_lun);
 }
 
 static void sbp2_release_target(struct kref *kref)
@@ -621,26 +768,31 @@ static void sbp2_release_target(struct kref *kref)
         struct sbp2_logical_unit *lu, *next;
         struct Scsi_Host *shost =
                 container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
+        struct scsi_device *sdev;
         struct fw_device *device = fw_device(tgt->unit->device.parent);
 
-        list_for_each_entry_safe(lu, next, &tgt->lu_list, link) {
-                if (lu->sdev)
-                        scsi_remove_device(lu->sdev);
+        /* prevent deadlocks */
+        sbp2_unblock(tgt);
 
-                if (!fw_device_is_shutdown(device))
-                        sbp2_send_management_orb(lu, tgt->node_id,
-                                        lu->generation, SBP2_LOGOUT_REQUEST,
-                                        lu->login_id, NULL);
+        list_for_each_entry_safe(lu, next, &tgt->lu_list, link) {
+                sdev = scsi_device_lookup(shost, 0, 0, sbp2_lun2int(lu->lun));
+                if (sdev) {
+                        scsi_remove_device(sdev);
+                        scsi_device_put(sdev);
+                }
+                sbp2_send_management_orb(lu, tgt->node_id, lu->generation,
+                                SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
 
                 fw_core_remove_address_handler(&lu->address_handler);
                 list_del(&lu->link);
                 kfree(lu);
         }
         scsi_remove_host(shost);
-        fw_notify("released %s\n", tgt->unit->device.bus_id);
+        fw_notify("released %s\n", tgt->bus_id);
 
         put_device(&tgt->unit->device);
         scsi_host_put(shost);
+        fw_device_put(device);
 }
 
 static struct workqueue_struct *sbp2_wq;
@@ -666,33 +818,42 @@ static void sbp2_login(struct work_struct *work)
 {
         struct sbp2_logical_unit *lu =
                 container_of(work, struct sbp2_logical_unit, work.work);
-        struct Scsi_Host *shost =
-                container_of((void *)lu->tgt, struct Scsi_Host, hostdata[0]);
+        struct sbp2_target *tgt = lu->tgt;
+        struct fw_device *device = fw_device(tgt->unit->device.parent);
+        struct Scsi_Host *shost;
         struct scsi_device *sdev;
-        struct scsi_lun eight_bytes_lun;
-        struct fw_unit *unit = lu->tgt->unit;
-        struct fw_device *device = fw_device(unit->device.parent);
         struct sbp2_login_response response;
         int generation, node_id, local_node_id;
 
+        if (fw_device_is_shutdown(device))
+                goto out;
+
         generation    = device->generation;
         smp_rmb();    /* node_id must not be older than generation */
         node_id       = device->node_id;
         local_node_id = device->card->node_id;
 
+        /* If this is a re-login attempt, log out, or we might be rejected. */
+        if (lu->has_sdev)
+                sbp2_send_management_orb(lu, device->node_id, generation,
+                                SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
+
         if (sbp2_send_management_orb(lu, node_id, generation,
                                 SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) {
-                if (lu->retries++ < 5)
+                if (lu->retries++ < 5) {
                         sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
-                else
-                        fw_error("failed to login to %s LUN %04x\n",
-                                 unit->device.bus_id, lu->lun);
+                } else {
+                        fw_error("%s: failed to login to LUN %04x\n",
+                                 tgt->bus_id, lu->lun);
+                        /* Let any waiting I/O fail from now on. */
+                        sbp2_unblock(lu->tgt);
+                }
                 goto out;
         }
 
-        lu->generation        = generation;
-        lu->tgt->node_id      = node_id;
-        lu->tgt->address_high = local_node_id << 16;
+        tgt->node_id      = node_id;
+        tgt->address_high = local_node_id << 16;
+        sbp2_set_generation(lu, generation);
 
         /* Get command block agent offset and login id. */
         lu->command_block_agent_address =
@@ -700,8 +861,8 @@ static void sbp2_login(struct work_struct *work)
                 response.command_block_agent.low;
         lu->login_id = LOGIN_RESPONSE_GET_LOGIN_ID(response);
 
-        fw_notify("logged in to %s LUN %04x (%d retries)\n",
-                  unit->device.bus_id, lu->lun, lu->retries);
+        fw_notify("%s: logged in to LUN %04x (%d retries)\n",
+                  tgt->bus_id, lu->lun, lu->retries);
 
 #if 0
         /* FIXME: The linux1394 sbp2 does this last step. */
@@ -711,26 +872,58 @@ static void sbp2_login(struct work_struct *work)
         PREPARE_DELAYED_WORK(&lu->work, sbp2_reconnect);
         sbp2_agent_reset(lu);
 
-        memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun));
-        eight_bytes_lun.scsi_lun[0] = (lu->lun >> 8) & 0xff;
-        eight_bytes_lun.scsi_lun[1] = lu->lun & 0xff;
+        /* This was a re-login. */
+        if (lu->has_sdev) {
+                sbp2_cancel_orbs(lu);
+                sbp2_conditionally_unblock(lu);
+                goto out;
+        }
 
-        sdev = __scsi_add_device(shost, 0, 0,
-                                 scsilun_to_int(&eight_bytes_lun), lu);
-        if (IS_ERR(sdev)) {
-                sbp2_send_management_orb(lu, node_id, generation,
-                                SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
-                /*
-                 * Set this back to sbp2_login so we fall back and
-                 * retry login on bus reset.
-                 */
-                PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
-        } else {
-                lu->sdev = sdev;
+        if (lu->tgt->workarounds & SBP2_WORKAROUND_DELAY_INQUIRY)
+                ssleep(SBP2_INQUIRY_DELAY);
+
+        shost = container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
+        sdev = __scsi_add_device(shost, 0, 0, sbp2_lun2int(lu->lun), lu);
+        /*
+         * FIXME:  We are unable to perform reconnects while in sbp2_login().
+         * Therefore __scsi_add_device() will get into trouble if a bus reset
+         * happens in parallel.  It will either fail or leave us with an
+         * unusable sdev.  As a workaround we check for this and retry the
+         * whole login and SCSI probing.
+         */
+
+        /* Reported error during __scsi_add_device() */
+        if (IS_ERR(sdev))
+                goto out_logout_login;
+
+        /* Unreported error during __scsi_add_device() */
+        smp_rmb(); /* get current card generation */
+        if (generation != device->card->generation) {
+                scsi_remove_device(sdev);
                 scsi_device_put(sdev);
+                goto out_logout_login;
         }
+
+        /* No error during __scsi_add_device() */
+        lu->has_sdev = true;
+        scsi_device_put(sdev);
+        sbp2_allow_block(lu);
+        goto out;
+
+ out_logout_login:
+        smp_rmb(); /* generation may have changed */
+        generation = device->generation;
+        smp_rmb(); /* node_id must not be older than generation */
+
+        sbp2_send_management_orb(lu, device->node_id, generation,
+                                 SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
+        /*
+         * If a bus reset happened, sbp2_update will have requeued
+         * lu->work already.  Reset the work from reconnect to login.
+         */
+        PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
  out:
-        sbp2_target_put(lu->tgt);
+        sbp2_target_put(tgt);
 }
 
 static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry)
@@ -751,10 +944,12 @@ static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry)
                 return -ENOMEM;
         }
 
-        lu->tgt  = tgt;
-        lu->sdev = NULL;
-        lu->lun  = lun_entry & 0xffff;
-        lu->retries = 0;
+        lu->tgt      = tgt;
+        lu->lun      = lun_entry & 0xffff;
+        lu->retries  = 0;
+        lu->has_sdev = false;
+        lu->blocked  = false;
+        ++tgt->dont_block;
         INIT_LIST_HEAD(&lu->orb_list);
         INIT_DELAYED_WORK(&lu->work, sbp2_login);
 
@@ -813,7 +1008,7 @@ static int sbp2_scan_unit_dir(struct sbp2_target *tgt, u32 *directory,
                         if (timeout > tgt->mgt_orb_timeout)
                                 fw_notify("%s: config rom contains %ds "
                                           "management ORB timeout, limiting "
-                                          "to %ds\n", tgt->unit->device.bus_id,
+                                          "to %ds\n", tgt->bus_id,
                                           timeout / 1000,
                                           tgt->mgt_orb_timeout / 1000);
                         break;
@@ -836,12 +1031,12 @@ static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model,
                                   u32 firmware_revision)
 {
         int i;
-        unsigned w = sbp2_param_workarounds;
+        unsigned int w = sbp2_param_workarounds;
 
         if (w)
                 fw_notify("Please notify linux1394-devel@lists.sourceforge.net "
                           "if you need the workarounds parameter for %s\n",
-                          tgt->unit->device.bus_id);
+                          tgt->bus_id);
 
         if (w & SBP2_WORKAROUND_OVERRIDE)
                 goto out;
@@ -863,8 +1058,7 @@ static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model,
         if (w)
                 fw_notify("Workarounds for %s: 0x%x "
                           "(firmware_revision 0x%06x, model_id 0x%06x)\n",
-                          tgt->unit->device.bus_id,
-                          w, firmware_revision, model);
+                          tgt->bus_id, w, firmware_revision, model);
         tgt->workarounds = w;
 }
 
@@ -888,6 +1082,7 @@ static int sbp2_probe(struct device *dev)
         tgt->unit = unit;
         kref_init(&tgt->kref);
         INIT_LIST_HEAD(&tgt->lu_list);
+        tgt->bus_id = unit->device.bus_id;
 
         if (fw_device_enable_phys_dma(device) < 0)
                 goto fail_shost_put;
@@ -895,6 +1090,8 @@ static int sbp2_probe(struct device *dev)
         if (scsi_add_host(shost, &unit->device) < 0)
                 goto fail_shost_put;
 
+        fw_device_get(device);
+
         /* Initialize to values that won't match anything in our table. */
         firmware_revision = 0xff000000;
         model = 0xff000000;
@@ -938,10 +1135,13 @@ static void sbp2_reconnect(struct work_struct *work)
 {
         struct sbp2_logical_unit *lu =
                 container_of(work, struct sbp2_logical_unit, work.work);
-        struct fw_unit *unit = lu->tgt->unit;
-        struct fw_device *device = fw_device(unit->device.parent);
+        struct sbp2_target *tgt = lu->tgt;
+        struct fw_device *device = fw_device(tgt->unit->device.parent);
         int generation, node_id, local_node_id;
 
+        if (fw_device_is_shutdown(device))
+                goto out;
+
         generation    = device->generation;
         smp_rmb();    /* node_id must not be older than generation */
         node_id       = device->node_id;
@@ -950,10 +1150,17 @@ static void sbp2_reconnect(struct work_struct *work)
         if (sbp2_send_management_orb(lu, node_id, generation,
                                      SBP2_RECONNECT_REQUEST,
                                      lu->login_id, NULL) < 0) {
-                if (lu->retries++ >= 5) {
-                        fw_error("failed to reconnect to %s\n",
-                                 unit->device.bus_id);
-                        /* Fall back and try to log in again. */
+                /*
+                 * If reconnect was impossible even though we are in the
+                 * current generation, fall back and try to log in again.
+                 *
+                 * We could check for "Function rejected" status, but
+                 * looking at the bus generation as simpler and more general.
+                 */
+                smp_rmb(); /* get current card generation */
+                if (generation == device->card->generation ||
+                    lu->retries++ >= 5) {
+                        fw_error("%s: failed to reconnect\n", tgt->bus_id);
                         lu->retries = 0;
                         PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
                 }
@@ -961,17 +1168,18 @@ static void sbp2_reconnect(struct work_struct *work)
                 goto out;
         }
 
-        lu->generation        = generation;
-        lu->tgt->node_id      = node_id;
-        lu->tgt->address_high = local_node_id << 16;
+        tgt->node_id      = node_id;
+        tgt->address_high = local_node_id << 16;
+        sbp2_set_generation(lu, generation);
 
-        fw_notify("reconnected to %s LUN %04x (%d retries)\n",
-                  unit->device.bus_id, lu->lun, lu->retries);
+        fw_notify("%s: reconnected to LUN %04x (%d retries)\n",
+                  tgt->bus_id, lu->lun, lu->retries);
 
         sbp2_agent_reset(lu);
         sbp2_cancel_orbs(lu);
+        sbp2_conditionally_unblock(lu);
  out:
-        sbp2_target_put(lu->tgt);
+        sbp2_target_put(tgt);
 }
 
 static void sbp2_update(struct fw_unit *unit)
@@ -986,6 +1194,7 @@ static void sbp2_update(struct fw_unit *unit)
          * Iteration over tgt->lu_list is therefore safe here.
          */
         list_for_each_entry(lu, &tgt->lu_list, link) {
+                sbp2_conditionally_block(lu);
                 lu->retries = 0;
                 sbp2_queue_work(lu, 0);
         }
@@ -1063,7 +1272,7 @@ complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
 
         if (status != NULL) {
                 if (STATUS_GET_DEAD(*status))
-                        sbp2_agent_reset(orb->lu);
+                        sbp2_agent_reset_no_wait(orb->lu);
 
                 switch (STATUS_GET_RESPONSE(*status)) {
                 case SBP2_STATUS_REQUEST_COMPLETE:
@@ -1089,6 +1298,7 @@ complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
                  * or when sending the write (less likely).
                  */
                 result = DID_BUS_BUSY << 16;
+                sbp2_conditionally_block(orb->lu);
         }
 
         dma_unmap_single(device->card->device, orb->base.request_bus,
@@ -1197,7 +1407,7 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
         struct sbp2_logical_unit *lu = cmd->device->hostdata;
         struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
         struct sbp2_command_orb *orb;
-        unsigned max_payload;
+        unsigned int max_payload;
         int retval = SCSI_MLQUEUE_HOST_BUSY;
 
         /*
@@ -1275,6 +1485,10 @@ static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
 {
         struct sbp2_logical_unit *lu = sdev->hostdata;
 
+        /* (Re-)Adding logical units via the SCSI stack is not supported. */
+        if (!lu)
+                return -ENOSYS;
+
         sdev->allow_restart = 1;
 
         /*
@@ -1319,7 +1533,7 @@ static int sbp2_scsi_abort(struct scsi_cmnd *cmd)
 {
         struct sbp2_logical_unit *lu = cmd->device->hostdata;
 
-        fw_notify("sbp2_scsi_abort\n");
+        fw_notify("%s: sbp2_scsi_abort\n", lu->tgt->bus_id);
         sbp2_agent_reset(lu);
         sbp2_cancel_orbs(lu);
 
diff --git a/drivers/firewire/fw-topology.c b/drivers/firewire/fw-topology.c
index 172c1867e9aa..e47bb040197a 100644
--- a/drivers/firewire/fw-topology.c
+++ b/drivers/firewire/fw-topology.c
@@ -383,6 +383,7 @@ void fw_destroy_nodes(struct fw_card *card)
         card->color++;
         if (card->local_node != NULL)
                 for_each_fw_node(card, card->local_node, report_lost_node);
+        card->local_node = NULL;
         spin_unlock_irqrestore(&card->lock, flags);
 }
 
diff --git a/drivers/firewire/fw-transaction.h b/drivers/firewire/fw-transaction.h
index fa7967b57408..09cb72870454 100644
--- a/drivers/firewire/fw-transaction.h
+++ b/drivers/firewire/fw-transaction.h
@@ -26,6 +26,7 @@
 #include <linux/fs.h>
 #include <linux/dma-mapping.h>
 #include <linux/firewire-constants.h>
+#include <asm/atomic.h>
 
 #define TCODE_IS_READ_REQUEST(tcode)    (((tcode) & ~1) == 4)
 #define TCODE_IS_BLOCK_PACKET(tcode)    (((tcode) &  1) != 0)
@@ -219,6 +220,7 @@ extern struct bus_type fw_bus_type;
 struct fw_card {
         const struct fw_card_driver *driver;
         struct device *device;
+        atomic_t device_count;
         struct kref kref;
 
         int node_id;