tree 29280b85bd5bc883a212d9936289612dd059f12b
parent 0844a3ff00e30cf7e8edbce40eab83593c051c78
author John Garry <john.garry@huawei.com> 1491830520 +0800
committer Martin K. Petersen <martin.petersen@oracle.com> 1491962464 -0400

scsi: hisi_sas: fix NULL deference when TMF timeouts

If a TMF timeouts (maybe due to unlikely scenario of an expander being
unplugged when TMF for remote device is active), when we eventually try
to free the slot, we crash as we dereference the slot's task, which has
already been released.

As a fix, add checks in the slot release code for a NULL task.

Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>