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

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>

diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 88d90dc..2a209e1 100644 (file)
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -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);