diff options
| author | Yuval Basson <ybason@marvell.com> | 2020-03-25 22:50:43 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-03-29 21:50:17 -0700 |
| commit | 3b85720d3fd72e6ef4de252cd2f67548eb645eb4 (patch) | |
| tree | 42f2fd37cba5c75362538ae91df1283538a8ae4f /drivers/net/ethernet/qlogic | |
| parent | 798dda818ad1fdad6240959241194b490d6660ee (diff) | |
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.
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>
Diffstat (limited to 'drivers/net/ethernet/qlogic')
| -rw-r--r-- | drivers/net/ethernet/qlogic/qed/qed_main.c | 13 |
1 files 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 2c189c637cca..96356e897c80 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, @@ -1123,7 +1120,7 @@ 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; @@ -1135,13 +1132,7 @@ static void qed_slowpath_wq_stop(struct qed_dev *cdev) /* 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); } } |