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[SCSI] libsas: fix deref before check in commit 70b25f890c 

commit 70b25f890c
Author: Tejun Heo <tj@kernel.org>
Date:   Thu Apr 15 09:00:08 2010 +0900

    [SCSI] fix locking around blk_abort_request()

Introduced a reference before check problem, fix this by moving the
lock shorthand code to be right at the point of actual use.

Reported-by: Dan Carpenter <error27@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
James Bottomley 2010-05-13 09:31:54 -05:00
parent b5dbc85871
commit 1b4d0d8ea7
2 changed files with 11 additions and 10 deletions
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5
drivers/scsi/libsas/sas_ata.c
View File

@ -395,12 +395,13 @@ int sas_ata_init_host_and_port(struct domain_device *found_dev,
void sas_ata_task_abort(struct sas_task *task)
{
struct ata_queued_cmd *qc = task->uldd_task;
struct request_queue *q = qc->scsicmd->device->request_queue;
struct completion *waiting;
unsigned long flags;
/* Bounce SCSI-initiated commands to the SCSI EH */
if (qc->scsicmd) {
struct request_queue *q = qc->scsicmd->device->request_queue;
unsigned long flags;
spin_lock_irqsave(q->queue_lock, flags);
blk_abort_request(qc->scsicmd->request);
spin_unlock_irqrestore(q->queue_lock, flags);

16
drivers/scsi/libsas/sas_scsi_host.c
View File

@ -1030,8 +1030,6 @@ int __sas_task_abort(struct sas_task *task)
void sas_task_abort(struct sas_task *task)
{
struct scsi_cmnd *sc = task->uldd_task;
struct request_queue *q = sc->device->request_queue;
unsigned long flags;
/* Escape for libsas internal commands */
if (!sc) {
@ -1043,13 +1041,15 @@ void sas_task_abort(struct sas_task *task)
if (dev_is_sata(task->dev)) {
sas_ata_task_abort(task);
return;
}
} else {
struct request_queue *q = sc->device->request_queue;
unsigned long flags;
spin_lock_irqsave(q->queue_lock, flags);
blk_abort_request(sc->request);
spin_unlock_irqrestore(q->queue_lock, flags);
scsi_schedule_eh(sc->device->host);
spin_lock_irqsave(q->queue_lock, flags);
blk_abort_request(sc->request);
spin_unlock_irqrestore(q->queue_lock, flags);
scsi_schedule_eh(sc->device->host);
}
}
int sas_slave_alloc(struct scsi_device *scsi_dev)