qla2xxx: cleanup cmd in qla workqueue before processing TMR
authorSwapnil Nagle <swapnil.nagle@purestorage.com>
Tue, 14 Jul 2015 20:00:43 +0000 (16:00 -0400)
committerNicholas Bellinger <nab@linux-iscsi.org>
Fri, 24 Jul 2015 21:19:39 +0000 (14:19 -0700)
commit8b2f5ff3d05c2c48b722c3cc67b8226f1601042b
tree4390f97dd0ca7443b01de2b4d79fbc73d26afe0c
parentb2032fd567326ad0b2d443bb6d96d2580ec670a5
qla2xxx: cleanup cmd in qla workqueue before processing TMR

Since cmds go into qla_tgt_wq and TMRs don't, it's possible that TMR
like TASK_ABORT can be queued over the cmd for which it was meant.
To avoid this race, use a per-port list to keep track of cmds that
are enqueued to qla_tgt_wq but not yet processed. When a TMR arrives,
iterate through this list and remove any cmds that match the TMR.
This patch supports TASK_ABORT and LUN_RESET.

Cc: <stable@vger.kernel.org> # v3.18+
Signed-off-by: Swapnil Nagle <swapnil.nagle@purestorage.com>
Signed-off-by: Alexei Potashnik <alexei@purestorage.com>
Acked-by: Quinn Tran <quinn.tran@qlogic.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@qlogic.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
drivers/scsi/qla2xxx/qla_dbg.c
drivers/scsi/qla2xxx/qla_def.h
drivers/scsi/qla2xxx/qla_os.c
drivers/scsi/qla2xxx/qla_target.c
drivers/scsi/qla2xxx/qla_target.h
drivers/scsi/qla2xxx/tcm_qla2xxx.c