3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jeff Skirvin <jeffrey.d.skir...@intel.com>
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.skir...@intel.com>
Reviewed-by: Lukasz Dorau <lukasz.do...@intel.com>
Signed-off-by: James Bottomley <jbottom...@parallels.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
Cc: Rui Xiang <rui.xi...@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/scsi/isci/task.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- a/drivers/scsi/isci/task.c
+++ b/drivers/scsi/isci/task.c
@@ -956,6 +956,7 @@ int isci_task_abort_task(struct sas_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
@@ -970,9 +971,11 @@ int isci_task_abort_task(struct sas_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);
@@ -1031,7 +1034,7 @@ int isci_task_abort_task(struct sas_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);
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
