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[SCSI] SCSI: fix scsi_kill_request() busy count handling 

scsi_kill_request() completes requests via normal SCSI completion path
which decrements busy counts; however, requests which get passed to
scsi_kill_request() aren't holding busy counts and scsi_kill_request()
don't increment them before invoking completion path resulting in
incorrect busy counts.  Bump up busy counts before invoking completion
path.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
hifive-unleashed-5.1
Tejun Heo 2006-04-11 17:27:53 +09:00 committed by James Bottomley
parent aedf349773
commit e36e0c8013
1 changed files with 15 additions and 0 deletions
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15
drivers/scsi/scsi_lib.c
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@ -1479,6 +1479,8 @@ static inline int scsi_host_queue_ready(struct request_queue *q,
static void scsi_kill_request(struct request *req, request_queue_t *q)
{
struct scsi_cmnd *cmd = req->special;
struct scsi_device *sdev = cmd->device;
struct Scsi_Host *shost = sdev->host;
blkdev_dequeue_request(req);
@ -1491,6 +1493,19 @@ static void scsi_kill_request(struct request *req, request_queue_t *q)
scsi_init_cmd_errh(cmd);
cmd->result = DID_NO_CONNECT << 16;
atomic_inc(&cmd->device->iorequest_cnt);
/*
* SCSI request completion path will do scsi_device_unbusy(),
* bump busy counts. To bump the counters, we need to dance
* with the locks as normal issue path does.
*/
sdev->device_busy++;
spin_unlock(sdev->request_queue->queue_lock);
spin_lock(shost->host_lock);
shost->host_busy++;
spin_unlock(shost->host_lock);
spin_lock(sdev->request_queue->queue_lock);
__scsi_done(cmd);
}