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| author | James Bottomley <James.Bottomley@suse.de> | 2010-05-13 16:31:54 +0200 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2010-05-16 21:34:58 +0200 |
| commit | 1b4d0d8ea7b3cbd107f345ab766416f9b38ce66a (patch) | |
| tree | a5aeda206eb92e702ad7e9b9e2b91e50fa6964d2 | |
| parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 (diff) | |
| download | linux-1b4d0d8ea7b3cbd107f345ab766416f9b38ce66a.tar.xz linux-1b4d0d8ea7b3cbd107f345ab766416f9b38ce66a.zip | |
[SCSI] libsas: fix deref before check in commit 70b25f890ce
commit 70b25f890ce9f0520c64075ce9225a5b020a513e
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>
| -rw-r--r-- | drivers/scsi/libsas/sas_ata.c | 5 | ||||
| -rw-r--r-- | drivers/scsi/libsas/sas_scsi_host.c | 16 |
2 files changed, 11 insertions, 10 deletions
diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c index 88f744672576..8c496b56556c 100644 --- a/drivers/scsi/libsas/sas_ata.c +++ b/drivers/scsi/libsas/sas_ata.c @@ -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); diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c index 822835055cef..53849f21ad42 100644 --- a/drivers/scsi/libsas/sas_scsi_host.c +++ b/drivers/scsi/libsas/sas_scsi_host.c @@ -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) |