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scsi: hisi_sas: fix NULL check in SMP abort task path

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This patch adds a NULL check of task->lldd_task before freeing the
slot in SMP path.

This is to guard against the scenario of the slot being freed during
the from the preceding internal abort.

Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Xiaofei Tan 2017-10-24 23:51:37 +08:00 committed by Martin K. Petersen
parent 1eb8eeac17
commit 378c233bcb
1 changed files with 1 additions and 1 deletions
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drivers/scsi/hisi_sas/hisi_sas_main.c
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@ -1161,7 +1161,7 @@ static int hisi_sas_abort_task(struct sas_task *task)
rc = hisi_sas_internal_task_abort(hisi_hba, device,
HISI_SAS_INT_ABT_CMD, tag);
if (rc == TMF_RESP_FUNC_FAILED) {
if (rc == TMF_RESP_FUNC_FAILED && task->lldd_task) {
spin_lock_irqsave(&hisi_hba->lock, flags);
hisi_sas_do_release_task(hisi_hba, task, slot);
spin_unlock_irqrestore(&hisi_hba->lock, flags);