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path: root/drivers/scsi/scsi_lib.c
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Diffstat (limited to 'drivers/scsi/scsi_lib.c')
-rw-r--r--drivers/scsi/scsi_lib.c32
1 files changed, 17 insertions, 15 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index ab55c2fa7ce..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;
}
@@ -400,10 +398,15 @@ static inline int scsi_host_is_busy(struct Scsi_Host *shost)
static void scsi_run_queue(struct request_queue *q)
{
struct scsi_device *sdev = q->queuedata;
- struct Scsi_Host *shost = sdev->host;
+ struct Scsi_Host *shost;
LIST_HEAD(starved_list);
unsigned long flags;
+ /* if the device is dead, sdev will be NULL, so no queue to run */
+ if (!sdev)
+ return;
+
+ shost = sdev->host;
if (scsi_target(sdev)->single_lun)
scsi_single_lun_run(sdev);
@@ -411,8 +414,6 @@ static void scsi_run_queue(struct request_queue *q)
list_splice_init(&shost->starved_list, &starved_list);
while (!list_empty(&starved_list)) {
- int flagset;
-
/*
* As long as shost is accepting commands and we have
* starved queues, call blk_run_queue. scsi_request_fn
@@ -436,18 +437,9 @@ static void scsi_run_queue(struct request_queue *q)
}
spin_unlock(shost->host_lock);
-
spin_lock(sdev->request_queue->queue_lock);
- flagset = test_bit(QUEUE_FLAG_REENTER, &q->queue_flags) &&
- !test_bit(QUEUE_FLAG_REENTER,
- &sdev->request_queue->queue_flags);
- if (flagset)
- queue_flag_set(QUEUE_FLAG_REENTER, sdev->request_queue);
__blk_run_queue(sdev->request_queue);
- if (flagset)
- queue_flag_clear(QUEUE_FLAG_REENTER, sdev->request_queue);
spin_unlock(sdev->request_queue->queue_lock);
-
spin_lock(shost->host_lock);
}
/* put any unprocessed entries back */
@@ -457,6 +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()
*