From: Yuval Basson <ybason@marvell.com>
Date: Wed, 25 Mar 2020 22:50:43 +0200
Subject: qed: Fix race condition between scheduling and destroying the
slowpath workqueue
Patch-mainline: v5.7-rc1
Git-commit: 3b85720d3fd72e6ef4de252cd2f67548eb645eb4
References: bsc#1086314 FATE#324886 bsc#1086313 FATE#324885 bsc#1086301 FATE#3248881
Calling queue_delayed_work concurrently with
destroy_workqueue might race to an unexpected outcome -
scheduled task after wq is destroyed or other resources
(like ptt_pool) are freed (yields NULL pointer dereference).
cancel_delayed_work prevents the race by cancelling
the timer triggered for scheduling a new task.
Fixes: 59ccf86fe ("qed: Add driver infrastucture for handling mfw requests")
Signed-off-by: Denis Bolotin <dbolotin@marvell.com>
Signed-off-by: Michal Kalderon <mkalderon@marvell.com>
Signed-off-by: Yuval Basson <ybason@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/qlogic/qed/qed_main.c | 13 ++-----------
1 file changed, 2 insertions(+), 11 deletions(-)
--- a/drivers/net/ethernet/qlogic/qed/qed_main.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_main.c
@@ -1083,9 +1083,6 @@ static void qed_update_pf_params(struct
#define QED_PERIODIC_DB_REC_INTERVAL_MS 100
#define QED_PERIODIC_DB_REC_INTERVAL \
msecs_to_jiffies(QED_PERIODIC_DB_REC_INTERVAL_MS)
-#define QED_PERIODIC_DB_REC_WAIT_COUNT 10
-#define QED_PERIODIC_DB_REC_WAIT_INTERVAL \
- (QED_PERIODIC_DB_REC_INTERVAL_MS / QED_PERIODIC_DB_REC_WAIT_COUNT)
static int qed_slowpath_delayed_work(struct qed_hwfn *hwfn,
enum qed_slowpath_wq_flag wq_flag,
@@ -1119,7 +1116,7 @@ void qed_periodic_db_rec_start(struct qe
static void qed_slowpath_wq_stop(struct qed_dev *cdev)
{
- int i, sleep_count = QED_PERIODIC_DB_REC_WAIT_COUNT;
+ int i;
if (IS_VF(cdev))
return;
@@ -1131,13 +1128,7 @@ static void qed_slowpath_wq_stop(struct
/* Stop queuing new delayed works */
cdev->hwfns[i].slowpath_wq_active = false;
- /* Wait until the last periodic doorbell recovery is executed */
- while (test_bit(QED_SLOWPATH_PERIODIC_DB_REC,
- &cdev->hwfns[i].slowpath_task_flags) &&
- sleep_count--)
- msleep(QED_PERIODIC_DB_REC_WAIT_INTERVAL);
-
- flush_workqueue(cdev->hwfns[i].slowpath_wq);
+ cancel_delayed_work(&cdev->hwfns[i].slowpath_task);
destroy_workqueue(cdev->hwfns[i].slowpath_wq);
}
}