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[SCSI] make scsi_queue_insert() use blk_requeue_request() 

scsi_queue_insert() used to use blk_insert_request() for requeueing
requests.  This depends on the unobvious behavior of
blk_insert_request() setting REQ_SPECIAL and REQ_SOFTBARRIER when
requeueing.  This patch makes scsi_queue_insert() use
blk_requeue_request().  As REQ_SPECIAL means special requests and
REQ_SOFTBARRIER is automatically handled by blk layer now, no flag
needs to be set.

Note that scsi_queue_insert() now calls scsi_run_queue() itself, and
the prototype of the function is added right above
scsi_queue_insert().  This is temporary, as later requeue path
consolidation patchset removes scsi_queue_insert().  By adding
temporary prototype, we can do away with unnecessarily moving
functions.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Tejun Heo 2005-04-24 02:08:52 -05:00 committed by James Bottomley
parent 283369ccc2
commit a1bf9d1d92
1 changed files with 14 additions and 5 deletions
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19
drivers/scsi/scsi_lib.c
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@ -96,6 +96,8 @@ int scsi_insert_special_req(struct scsi_request *sreq, int at_head)
return 0;
}
static void scsi_run_queue(struct request_queue *q);
/*
* Function: scsi_queue_insert()
*
@ -119,6 +121,8 @@ int scsi_queue_insert(struct scsi_cmnd *cmd, int reason)
{
struct Scsi_Host *host = cmd->device->host;
struct scsi_device *device = cmd->device;
struct request_queue *q = device->request_queue;
unsigned long flags;
SCSI_LOG_MLQUEUE(1,
printk("Inserting command %p into mlqueue\n", cmd));
@ -160,17 +164,22 @@ int scsi_queue_insert(struct scsi_cmnd *cmd, int reason)
scsi_device_unbusy(device);
/*
* Insert this command at the head of the queue for it's device.
* It will go before all other commands that are already in the queue.
* Requeue this command. It will go before all other commands
* that are already in the queue.
*
* NOTE: there is magic here about the way the queue is plugged if
* we have no outstanding commands.
*
* Although this *doesn't* plug the queue, it does call the request
* Although we *don't* plug the queue, we call the request
* function. The SCSI request function detects the blocked condition
* and plugs the queue appropriately.
*/
blk_insert_request(device->request_queue, cmd->request, 1, cmd, 1);
*/
spin_lock_irqsave(q->queue_lock, flags);
blk_requeue_request(q, cmd->request);
spin_unlock_irqrestore(q->queue_lock, flags);
scsi_run_queue(q);
return 0;
}