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scsi: pm80xx: Fix TMF task completion race condition 

The TMF timeout timer may trigger at the same time when the response from a
controller is being handled. When this happens the SAS task may get freed
before the response processing is finished.

Fix this by calling complete() only when SAS_TASK_STATE_DONE is not set.

A similar race condition was fixed in commit b90cd6f2b9 ("scsi: libsas:
fix a race condition when smp task timeout")

Link: https://lore.kernel.org/r/20210707185945.35559-1-ipylypiv@google.com
Reviewed-by: Vishakha Channapattan <vishakhavc@google.com>
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Igor Pylypiv 2021-07-07 11:59:45 -07:00 committed by Martin K. Petersen
parent a47fa41381
commit d712d3fb48
1 changed files with 15 additions and 17 deletions
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32
drivers/scsi/pm8001/pm8001_sas.c
View File

@ -684,8 +684,7 @@ int pm8001_dev_found(struct domain_device *dev)
void pm8001_task_done(struct sas_task *task)
{
if (!del_timer(&task->slow_task->timer))
return;
del_timer(&task->slow_task->timer);
complete(&task->slow_task->completion);
}
@ -693,9 +692,14 @@ static void pm8001_tmf_timedout(struct timer_list *t)
{
struct sas_task_slow *slow = from_timer(slow, t, timer);
struct sas_task *task = slow->task;
unsigned long flags;
task->task_state_flags |= SAS_TASK_STATE_ABORTED;
complete(&task->slow_task->completion);
spin_lock_irqsave(&task->task_state_lock, flags);
if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
task->task_state_flags |= SAS_TASK_STATE_ABORTED;
complete(&task->slow_task->completion);
}
spin_unlock_irqrestore(&task->task_state_lock, flags);
}
#define PM8001_TASK_TIMEOUT 20
@ -748,13 +752,10 @@ static int pm8001_exec_internal_tmf_task(struct domain_device *dev,
}
res = -TMF_RESP_FUNC_FAILED;
/* Even TMF timed out, return direct. */
if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
pm8001_dbg(pm8001_ha, FAIL,
"TMF task[%x]timeout.\n",
tmf->tmf);
goto ex_err;
}
if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
pm8001_dbg(pm8001_ha, FAIL, "TMF task[%x]timeout.\n",
tmf->tmf);
goto ex_err;
}
if (task->task_status.resp == SAS_TASK_COMPLETE &&
@ -834,12 +835,9 @@ pm8001_exec_internal_task_abort(struct pm8001_hba_info *pm8001_ha,
wait_for_completion(&task->slow_task->completion);
res = TMF_RESP_FUNC_FAILED;
/* Even TMF timed out, return direct. */
if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
pm8001_dbg(pm8001_ha, FAIL,
"TMF task timeout.\n");
goto ex_err;
}
if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
pm8001_dbg(pm8001_ha, FAIL, "TMF task timeout.\n");
goto ex_err;
}
if (task->task_status.resp == SAS_TASK_COMPLETE &&