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authorLinus Torvalds <torvalds@linux-foundation.org>2011-05-18 06:49:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-18 06:49:02 -0700
commita2b9c1f6208126e6df6c02428c501f8853685812 (patch)
treee36762d385bb490914a72485c4da4431e4b937d3 /drivers/scsi/scsi_lib.c
parent2e9521fd656f05a716b5294a7dbebd37ced05e43 (diff)
parent3ec717b7ca4ee1d75d77e4f6286430d8f01d1dbd (diff)
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
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
-rw-r--r--drivers/scsi/scsi_lib.c20
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()
*