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scsi: scsi_dh_alua: Warn if the first argument of alua_rtpg_queue() is NULL 

Callers must provide a valid port group to alua_rtpg_queue().  Issue a
kernel warning if that is not the case.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Tang Junhui <tang.junhui@zte.com.cn>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2017-03-17 17:02:03 -07:00 committed by Martin K. Petersen
parent 7cb689fe42
commit 0aeccdfe22
1 changed files with 1 additions and 1 deletions
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2
drivers/scsi/device_handler/scsi_dh_alua.c
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@ -876,7 +876,7 @@ static bool alua_rtpg_queue(struct alua_port_group *pg,
unsigned long flags;
struct workqueue_struct *alua_wq = kaluad_wq;
if (!pg || scsi_device_get(sdev))
if (WARN_ON_ONCE(!pg) || scsi_device_get(sdev))
return false;
spin_lock_irqsave(&pg->lock, flags);