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| author | Tejun Heo <tj@kernel.org> | 2010-04-15 09:00:08 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-05-12 15:03:11 -0700 |
| commit | 5a904363da074781118bc161a1149494bf195128 (patch) | |
| tree | db91be098f86dcde432b70df86179ad87728ae0e | |
| parent | 3054cd85318d5bcf403352746bda26287b1efe9f (diff) | |
| download | lwn-5a904363da074781118bc161a1149494bf195128.tar.gz lwn-5a904363da074781118bc161a1149494bf195128.zip | |
SCSI: fix locking around blk_abort_request()
commit 70b25f890ce9f0520c64075ce9225a5b020a513e upstream.
blk_abort_request() expects queue lock to be held by the caller.
Grab it before calling the function.
Lack of this synchronization led to infinite loop on corrupt
q->timeout_list.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/scsi/libsas/sas_ata.c | 4 | ||||
| -rw-r--r-- | drivers/scsi/libsas/sas_scsi_host.c | 4 |
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c index e15501170698..816ab97eb16d 100644 --- a/drivers/scsi/libsas/sas_ata.c +++ b/drivers/scsi/libsas/sas_ata.c @@ -394,11 +394,15 @@ 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) { + spin_lock_irqsave(q->queue_lock, flags); blk_abort_request(qc->scsicmd->request); + spin_unlock_irqrestore(q->queue_lock, flags); scsi_schedule_eh(qc->scsicmd->device->host); return; } diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c index 14b13196b22d..b672d10e2a90 100644 --- a/drivers/scsi/libsas/sas_scsi_host.c +++ b/drivers/scsi/libsas/sas_scsi_host.c @@ -1029,6 +1029,8 @@ 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) { @@ -1043,7 +1045,9 @@ void sas_task_abort(struct sas_task *task) return; } + 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); } |