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| author | Jeff Skirvin <jeffrey.d.skirvin@intel.com> | 2013-07-11 17:18:58 -0700 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2013-07-23 07:16:57 -0700 |
| commit | 96f15f29038e58e1b0a96483e2b369ff446becf1 (patch) | |
| tree | a6ad8d41ad4f0f3f783890dd35951d9ac23662f7 /drivers/scsi | |
| parent | ecb2cf1a6b63825a258ff4fe0d7f3070fbe4676b (diff) | |
| download | lwn-96f15f29038e58e1b0a96483e2b369ff446becf1.tar.gz lwn-96f15f29038e58e1b0a96483e2b369ff446becf1.zip | |
[SCSI] isci: Fix a race condition in the SSP task management path
This commit fixes a race condition in the isci driver abort task and SSP
device task management path. The race is caused when an I/O termination
in the SCU hardware is necessary because of an SSP target timeout condition,
and the check of the I/O end state races against the HW-termination-driven
end state. The failure of the race meant that no TMF was sent to the device
to clean-up the pending I/O.
Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Reviewed-by: Lukasz Dorau <lukasz.dorau@intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/isci/task.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/scsi/isci/task.c b/drivers/scsi/isci/task.c index 9bb020ac089c..0d30ca849e8f 100644 --- a/drivers/scsi/isci/task.c +++ b/drivers/scsi/isci/task.c @@ -491,6 +491,7 @@ int isci_task_abort_task(struct sas_task *task) struct isci_tmf tmf; int ret = TMF_RESP_FUNC_FAILED; unsigned long flags; + int target_done_already = 0; /* Get the isci_request reference from the task. Note that * this check does not depend on the pending request list @@ -505,9 +506,11 @@ int isci_task_abort_task(struct sas_task *task) /* If task is already done, the request isn't valid */ if (!(task->task_state_flags & SAS_TASK_STATE_DONE) && (task->task_state_flags & SAS_TASK_AT_INITIATOR) && - old_request) + old_request) { idev = isci_get_device(task->dev->lldd_dev); - + target_done_already = test_bit(IREQ_COMPLETE_IN_TARGET, + &old_request->flags); + } spin_unlock(&task->task_state_lock); spin_unlock_irqrestore(&ihost->scic_lock, flags); @@ -561,7 +564,7 @@ int isci_task_abort_task(struct sas_task *task) if (task->task_proto == SAS_PROTOCOL_SMP || sas_protocol_ata(task->task_proto) || - test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags) || + target_done_already || test_bit(IDEV_GONE, &idev->flags)) { spin_unlock_irqrestore(&ihost->scic_lock, flags); |