firewire: sbp2: replace card lock by target lock

firewire-core uses fw_card.lock to protect topology data and transaction
data.  firewire-sbp2 uses fw_card.lock for entirely unrelated purposes.

Introduce a sbp2_target.lock to firewire-sbp2 and replace all
fw_card.lock uses in the driver.  fw_card.lock is now entirely private
to firewire-core.  This has no immediate advantage apart from making it
clear in the code that firewire-sbp2 does not interact with the core
via the core lock.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 29 insertions, 31 deletions

diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c
index 1f3f37a39a60..64ac8f8f5098 100644
--- a/drivers/firewire/sbp2.c
+++ b/drivers/firewire/sbp2.c
@@ -174,6 +174,7 @@ struct sbp2_target {
         unsigned int mgt_orb_timeout;
         unsigned int max_payload;
 
+        spinlock_t lock;
         int dont_block; /* counter for each logical unit */
         int blocked;    /* ditto */
 };
@@ -270,6 +271,7 @@ struct sbp2_orb {
         dma_addr_t request_bus;
         int rcode;
         void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status);
+        struct sbp2_logical_unit *lu;
         struct list_head link;
 };
 
@@ -321,7 +323,6 @@ struct sbp2_command_orb {
                 u8 command_block[SBP2_MAX_CDB_SIZE];
         } request;
         struct scsi_cmnd *cmd;
-        struct sbp2_logical_unit *lu;
 
         struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8)));
         dma_addr_t page_table_bus;
@@ -444,7 +445,7 @@ static void sbp2_status_write(struct fw_card *card, struct fw_request *request,
         }
 
         /* Lookup the orb corresponding to this status write. */
-        spin_lock_irqsave(&card->lock, flags);
+        spin_lock_irqsave(&lu->tgt->lock, flags);
         list_for_each_entry(orb, &lu->orb_list, link) {
                 if (STATUS_GET_ORB_HIGH(status) == 0 &&
                     STATUS_GET_ORB_LOW(status) == orb->request_bus) {
@@ -453,7 +454,7 @@ static void sbp2_status_write(struct fw_card *card, struct fw_request *request,
                         break;
                 }
         }
-        spin_unlock_irqrestore(&card->lock, flags);
+        spin_unlock_irqrestore(&lu->tgt->lock, flags);
 
         if (&orb->link != &lu->orb_list) {
                 orb->callback(orb, &status);
@@ -480,18 +481,18 @@ static void complete_transaction(struct fw_card *card, int rcode,
          * been set and only does the cleanup if the transaction
          * failed and we didn't already get a status write.
          */
-        spin_lock_irqsave(&card->lock, flags);
+        spin_lock_irqsave(&orb->lu->tgt->lock, flags);
 
         if (orb->rcode == -1)
                 orb->rcode = rcode;
         if (orb->rcode != RCODE_COMPLETE) {
                 list_del(&orb->link);
-                spin_unlock_irqrestore(&card->lock, flags);
+                spin_unlock_irqrestore(&orb->lu->tgt->lock, flags);
 
                 orb->callback(orb, NULL);
                 kref_put(&orb->kref, free_orb); /* orb callback reference */
         } else {
-                spin_unlock_irqrestore(&card->lock, flags);
+                spin_unlock_irqrestore(&orb->lu->tgt->lock, flags);
         }
 
         kref_put(&orb->kref, free_orb); /* transaction callback reference */
@@ -507,9 +508,10 @@ static void sbp2_send_orb(struct sbp2_orb *orb, struct sbp2_logical_unit *lu,
         orb_pointer.high = 0;
         orb_pointer.low = cpu_to_be32(orb->request_bus);
 
-        spin_lock_irqsave(&device->card->lock, flags);
+        orb->lu = lu;
+        spin_lock_irqsave(&lu->tgt->lock, flags);
         list_add_tail(&orb->link, &lu->orb_list);
-        spin_unlock_irqrestore(&device->card->lock, flags);
+        spin_unlock_irqrestore(&lu->tgt->lock, flags);
 
         kref_get(&orb->kref); /* transaction callback reference */
         kref_get(&orb->kref); /* orb callback reference */
@@ -527,9 +529,9 @@ static int sbp2_cancel_orbs(struct sbp2_logical_unit *lu)
         int retval = -ENOENT;
 
         INIT_LIST_HEAD(&list);
-        spin_lock_irq(&device->card->lock);
+        spin_lock_irq(&lu->tgt->lock);
         list_splice_init(&lu->orb_list, &list);
-        spin_unlock_irq(&device->card->lock);
+        spin_unlock_irq(&lu->tgt->lock);
 
         list_for_each_entry_safe(orb, next, &list, link) {
                 retval = 0;
@@ -686,14 +688,11 @@ static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu)
                         &d, 4, complete_agent_reset_write_no_wait, t);
 }
 
-static inline void sbp2_allow_block(struct sbp2_logical_unit *lu)
+static inline void sbp2_allow_block(struct sbp2_target *tgt)
 {
-        struct sbp2_target *tgt = lu->tgt;
-        struct fw_card *card = target_parent_device(tgt)->card;
-
-        spin_lock_irq(&card->lock);
+        spin_lock_irq(&tgt->lock);
         --tgt->dont_block;
-        spin_unlock_irq(&card->lock);
+        spin_unlock_irq(&tgt->lock);
 }
 
 /*
@@ -702,7 +701,7 @@ static inline void sbp2_allow_block(struct sbp2_logical_unit *lu)
  *     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,
+ * Note, scsi_block_requests() must be called while holding tgt->lock,
  * otherwise it might foil sbp2_[conditionally_]unblock()'s attempt to
  * unblock the target.
  */
@@ -714,20 +713,20 @@ static void sbp2_conditionally_block(struct sbp2_logical_unit *lu)
                 container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
         unsigned long flags;
 
-        spin_lock_irqsave(&card->lock, flags);
+        spin_lock_irqsave(&tgt->lock, flags);
         if (!tgt->dont_block && !lu->blocked &&
             lu->generation != card->generation) {
                 lu->blocked = true;
                 if (++tgt->blocked == 1)
                         scsi_block_requests(shost);
         }
-        spin_unlock_irqrestore(&card->lock, flags);
+        spin_unlock_irqrestore(&tgt->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
+ * tgt->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)
@@ -738,12 +737,12 @@ static void sbp2_conditionally_unblock(struct sbp2_logical_unit *lu)
                 container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
         bool unblock = false;
 
-        spin_lock_irq(&card->lock);
+        spin_lock_irq(&tgt->lock);
         if (lu->blocked && lu->generation == card->generation) {
                 lu->blocked = false;
                 unblock = --tgt->blocked == 0;
         }
-        spin_unlock_irq(&card->lock);
+        spin_unlock_irq(&tgt->lock);
 
         if (unblock)
                 scsi_unblock_requests(shost);
@@ -752,18 +751,17 @@ static void sbp2_conditionally_unblock(struct sbp2_logical_unit *lu)
 /*
  * 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
+ * tgt->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 = target_parent_device(tgt)->card;
         struct Scsi_Host *shost =
                 container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
 
-        spin_lock_irq(&card->lock);
+        spin_lock_irq(&tgt->lock);
         ++tgt->dont_block;
-        spin_unlock_irq(&card->lock);
+        spin_unlock_irq(&tgt->lock);
 
         scsi_unblock_requests(shost);
 }
@@ -899,7 +897,7 @@ static void sbp2_login(struct work_struct *work)
         /* No error during __scsi_add_device() */
         lu->has_sdev = true;
         scsi_device_put(sdev);
-        sbp2_allow_block(lu);
+        sbp2_allow_block(tgt);
 
         return;
 
@@ -1158,6 +1156,7 @@ static int sbp2_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
         dev_set_drvdata(&unit->device, tgt);
         tgt->unit = unit;
         INIT_LIST_HEAD(&tgt->lu_list);
+        spin_lock_init(&tgt->lock);
         tgt->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
 
         if (fw_device_enable_phys_dma(device) < 0)
@@ -1354,12 +1353,12 @@ static void complete_command_orb(struct sbp2_orb *base_orb,
 {
         struct sbp2_command_orb *orb =
                 container_of(base_orb, struct sbp2_command_orb, base);
-        struct fw_device *device = target_parent_device(orb->lu->tgt);
+        struct fw_device *device = target_parent_device(base_orb->lu->tgt);
         int result;
 
         if (status != NULL) {
                 if (STATUS_GET_DEAD(*status))
-                        sbp2_agent_reset_no_wait(orb->lu);
+                        sbp2_agent_reset_no_wait(base_orb->lu);
 
                 switch (STATUS_GET_RESPONSE(*status)) {
                 case SBP2_STATUS_REQUEST_COMPLETE:
@@ -1385,7 +1384,7 @@ static void complete_command_orb(struct sbp2_orb *base_orb,
                  * or when sending the write (less likely).
                  */
                 result = DID_BUS_BUSY << 16;
-                sbp2_conditionally_block(orb->lu);
+                sbp2_conditionally_block(base_orb->lu);
         }
 
         dma_unmap_single(device->card->device, orb->base.request_bus,
@@ -1482,7 +1481,6 @@ static int sbp2_scsi_queuecommand(struct Scsi_Host *shost,
         /* Initialize rcode to something not RCODE_COMPLETE. */
         orb->base.rcode = -1;
         kref_init(&orb->base.kref);
-        orb->lu = lu;
         orb->cmd = cmd;
         orb->request.next.high = cpu_to_be32(SBP2_ORB_NULL);
         orb->request.misc = cpu_to_be32(