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| author | Jeff Skirvin <jeffrey.d.skirvin@intel.com> | 2013-07-11 17:18:58 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-08-02 22:15:04 +0200 |
| commit | 6af864ccfe6d6d079db3e488b77b95fa65eb7799 (patch) | |
| tree | 7008424ed3e9b29ba534ff5aff05ab77bf02c354 /drivers/scsi | |
| parent | ff7facf5e808245dc6dc7abc550607db6becc59f (diff) | |
| download | kernel_samsung_smdk4412-6af864ccfe6d6d079db3e488b77b95fa65eb7799.zip kernel_samsung_smdk4412-6af864ccfe6d6d079db3e488b77b95fa65eb7799.tar.gz kernel_samsung_smdk4412-6af864ccfe6d6d079db3e488b77b95fa65eb7799.tar.bz2 | |
isci: Fix a race condition in the SSP task management path
commit 96f15f29038e58e1b0a96483e2b369ff446becf1 upstream.
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>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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 66ad3dc..e294d11 100644 --- a/drivers/scsi/isci/task.c +++ b/drivers/scsi/isci/task.c @@ -1038,6 +1038,7 @@ int isci_task_abort_task(struct sas_task *task) int ret = TMF_RESP_FUNC_FAILED; unsigned long flags; int perform_termination = 0; + 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 @@ -1052,9 +1053,11 @@ 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) { isci_device = isci_lookup_device(task->dev); - + target_done_already = test_bit(IREQ_COMPLETE_IN_TARGET, + &old_request->flags); + } spin_unlock(&task->task_state_lock); spin_unlock_irqrestore(&isci_host->scic_lock, flags); @@ -1116,7 +1119,7 @@ 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) { spin_unlock_irqrestore(&isci_host->scic_lock, flags); |