netdev - [PATCH net-next 3/3] qed: Fix race condition between scheduling and destroying the slowpath workqueue

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Message-ID: <20200324141348.7897-4-ybason@marvell.com>
Date:   Tue, 24 Mar 2020 16:13:48 +0200
From:   Yuval Basson <ybason@...vell.com>
To:     <davem@...emloft.net>, <netdev@...r.kernel.org>
CC:     Yuval Basson <ybason@...vell.com>,
        Denis Bolotin <dbolotin@...vell.com>
Subject: [PATCH net-next 3/3] qed: Fix race condition between scheduling and destroying the slowpath workqueue

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.

Signed-off-by: Yuval Basson <ybason@...vell.com>
Signed-off-by: Denis Bolotin <dbolotin@...vell.com>
---
 drivers/net/ethernet/qlogic/qed/qed_main.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_main.c b/drivers/net/ethernet/qlogic/qed/qed_main.c
index fb13863..ade927d 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_main.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_main.c
@@ -1087,9 +1087,6 @@ static void qed_update_pf_params(struct qed_dev *cdev,
 #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,
@@ -1126,7 +1123,7 @@ void qed_periodic_db_rec_start(struct qed_hwfn *p_hwfn)
 
 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;
@@ -1139,13 +1136,7 @@ static void qed_slowpath_wq_stop(struct qed_dev *cdev)
 		clear_bit(QED_SLOWPATH_ACTIVE,
 			  &cdev->hwfns[i].slowpath_task_flags);
 
-		/* 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);
 	}
 }
-- 
1.8.3.1