This is a note to let you know that I've just added the patch titled
isci: Fix a race condition in the SSP task management path
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
isci-fix-a-race-condition-in-the-ssp-task-management-path.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6af864ccfe6d6d079db3e488b77b95fa65eb7799 Mon Sep 17 00:00:00 2001
From: Jeff Skirvin <jeffrey.d.skirvin@xxxxxxxxx>
Date: Thu, 11 Jul 2013 17:18:58 -0700
Subject: isci: Fix a race condition in the SSP task management path
From: Jeff Skirvin <jeffrey.d.skirvin@xxxxxxxxx>
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@xxxxxxxxx>
Reviewed-by: Lukasz Dorau <lukasz.dorau@xxxxxxxxx>
Signed-off-by: James Bottomley <JBottomley@xxxxxxxxxxxxx>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Rui Xiang <rui.xiang@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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);
Patches currently in stable-queue which might be from jeffrey.d.skirvin@xxxxxxxxx are
queue-3.4/isci-fix-a-race-condition-in-the-ssp-task-management-path.patch
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