[PATCH 4.8 39/92] scsi: scsi_dh_alua: fix missing kref_put() in alua_rtpg_work()

[Greg Kroah-Hartman]

4.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: tang.junhui <tang.junhui@xxxxxxxxxx>

commit 1fdd14279eab2e9f79745631379f0c53cb8f9a5a upstream.

Reference count of pg leaks in alua_rtpg_work() since kref_put() is not
called to decrease the reference count of pg when the condition
pg->rtpg_sdev==NULL satisfied (actually it is easy to satisfy), it would
cause memory of pg leakage.

Signed-off-by: tang.junhui <tang.junhui@xxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/scsi/device_handler/scsi_dh_alua.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -792,6 +792,7 @@ static void alua_rtpg_work(struct work_s
 		WARN_ON(pg->flags & ALUA_PG_RUN_RTPG);
 		WARN_ON(pg->flags & ALUA_PG_RUN_STPG);
 		spin_unlock_irqrestore(&pg->lock, flags);
+		kref_put(&pg->kref, release_port_group);
 		return;
 	}
 	if (pg->flags & ALUA_SYNC_STPG)