[PATCH 3.11 043/208] qla2xxx: Fix schedule_delayed_work() for target timeout calculations

[Luis Henriques]

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

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

From: Shivaram Upadhyayula <shivaram.u at quadstor.com>

commit 63832aabec12a28a41a221773ab3819d30ba0a67 upstream.

This patch fixes two cases in qla_target.c code where the
schedule_delayed_work() value was being incorrectly calculated
from sess->expires - jiffies.

Signed-off-by: Shivaram U <shivaram.u at quadstor.com>
Signed-off-by: Nicholas Bellinger <nab at linux-iscsi.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/scsi/qla2xxx/qla_target.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index 83a8f7a..2a636c1 100644
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -481,7 +481,7 @@ static void qlt_schedule_sess_for_deletion(struct qla_tgt_sess *sess,
 		schedule_delayed_work(&tgt->sess_del_work, 0);
 	else
 		schedule_delayed_work(&tgt->sess_del_work,
-		    jiffies - sess->expires);
+		    sess->expires - jiffies);
 }
 
 /* ha->hardware_lock supposed to be held on entry */
@@ -560,13 +560,14 @@ static void qlt_del_sess_work_fn(struct delayed_work *work)
 	struct scsi_qla_host *vha = tgt->vha;
 	struct qla_hw_data *ha = vha->hw;
 	struct qla_tgt_sess *sess;
-	unsigned long flags;
+	unsigned long flags, elapsed;
 
 	spin_lock_irqsave(&ha->hardware_lock, flags);
 	while (!list_empty(&tgt->del_sess_list)) {
 		sess = list_entry(tgt->del_sess_list.next, typeof(*sess),
 		    del_list_entry);
-		if (time_after_eq(jiffies, sess->expires)) {
+		elapsed = jiffies;
+		if (time_after_eq(elapsed, sess->expires)) {
 			qlt_undelete_sess(sess);
 
 			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf004,
@@ -576,7 +577,7 @@ static void qlt_del_sess_work_fn(struct delayed_work *work)
 			ha->tgt.tgt_ops->put_sess(sess);
 		} else {
 			schedule_delayed_work(&tgt->sess_del_work,
-			    jiffies - sess->expires);
+			    sess->expires - elapsed);
 			break;
 		}
 	}
-- 
1.8.3.2