scsi: lpfc: fix pci hot plug crash in list_add call
authorDick Kennedy <dick.kennedy@broadcom.com>
Sat, 30 Sep 2017 00:34:28 +0000 (17:34 -0700)
committerMartin K. Petersen <martin.petersen@oracle.com>
Tue, 3 Oct 2017 02:46:32 +0000 (22:46 -0400)
commit401bb4169da655f3e5d28d0b208182e1ab60bf2a
tree10039b169d1a4ea1901cf95b71a1d15fb203930c
parent1901762f2ca2747ed269239ca5332a8023ce4e3d
scsi: lpfc: fix pci hot plug crash in list_add call

During pci hot plug, the kernel crashes in a list_add_call

The lookup by tag function will return null if the IOCB is out of range
or does not have the on txcmplq flag set.

Fix: Check for null return from lookup by tag.

Cc: <stable@vger.kernel.org> # 4.12+
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
drivers/scsi/lpfc/lpfc_sli.c