Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  block: don't delay blk_run_queue_async
  scsi: remove performance regression due to async queue run
  blk-throttle: Use task_subsys_state() to determine a task's blkio_cgroup
  block: rescan partitions on invalidated devices on -ENOMEDIA too
  cdrom: always check_disk_change() on open
  block: unexport DISK_EVENT_MEDIA_CHANGE for legacy/fringe drivers

1 files changed, 16 insertions, 4 deletions

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 0bac91e7237..ec1803a4872 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -74,8 +74,6 @@ struct kmem_cache *scsi_sdb_cache;
  */
 #define SCSI_QUEUE_DELAY        3
 
-static void scsi_run_queue(struct request_queue *q);
-
 /*
  * Function:    scsi_unprep_request()
  *
@@ -161,7 +159,7 @@ static int __scsi_queue_insert(struct scsi_cmnd *cmd, int reason, int unbusy)
         blk_requeue_request(q, cmd->request);
         spin_unlock_irqrestore(q->queue_lock, flags);
 
-        scsi_run_queue(q);
+        kblockd_schedule_work(q, &device->requeue_work);
 
         return 0;
 }
@@ -438,7 +436,11 @@ static void scsi_run_queue(struct request_queue *q)
                         continue;
                 }
 
-                blk_run_queue_async(sdev->request_queue);
+                spin_unlock(shost->host_lock);
+                spin_lock(sdev->request_queue->queue_lock);
+                __blk_run_queue(sdev->request_queue);
+                spin_unlock(sdev->request_queue->queue_lock);
+                spin_lock(shost->host_lock);
         }
         /* put any unprocessed entries back */
         list_splice(&starved_list, &shost->starved_list);
@@ -447,6 +449,16 @@ static void scsi_run_queue(struct request_queue *q)
         blk_run_queue(q);
 }
 
+void scsi_requeue_run_queue(struct work_struct *work)
+{
+        struct scsi_device *sdev;
+        struct request_queue *q;
+
+        sdev = container_of(work, struct scsi_device, requeue_work);
+        q = sdev->request_queue;
+        scsi_run_queue(q);
+}
+
 /*
  * Function:    scsi_requeue_command()
  *