diff options
| author | Moshe Shemesh <moshe@mellanox.com> | 2017-10-19 14:14:29 +0300 |
|---|---|---|
| committer | Saeed Mahameed <saeedm@mellanox.com> | 2017-10-26 10:47:27 +0300 |
| commit | 6377ed0bbae6fa28853e1679d068a9106c8a8908 (patch) | |
| tree | 4993b5cffac95b036566ffbe55287ec26794ff0d | |
| parent | 5c25f65fd1e42685f7ccd80e0621829c105785d9 (diff) | |
| download | linux-6377ed0bbae6fa28853e1679d068a9106c8a8908.tar.xz | |
net/mlx5: Fix health work queue spin lock to IRQ safe
spin_lock/unlock of health->wq_lock should be IRQ safe.
It was changed to spin_lock_irqsave since adding commit 0179720d6be2
("net/mlx5: Introduce trigger_health_work function") which uses
spin_lock from asynchronous event (IRQ) context.
Thus, all spin_lock/unlock of health->wq_lock should have been moved
to IRQ safe mode.
However, one occurrence on new code using this lock missed that
change, resulting in possible deadlock:
kernel: Possible unsafe locking scenario:
kernel: CPU0
kernel: ----
kernel: lock(&(&health->wq_lock)->rlock);
kernel: <Interrupt>
kernel: lock(&(&health->wq_lock)->rlock);
kernel: #012 *** DEADLOCK ***
Fixes: 2a0165a034ac ("net/mlx5: Cancel delayed recovery work when unloading the driver")
Signed-off-by: Moshe Shemesh <moshe@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/health.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/health.c b/drivers/net/ethernet/mellanox/mlx5/core/health.c index 8aea0a065e56..db86e1506c8b 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/health.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/health.c @@ -356,10 +356,11 @@ void mlx5_drain_health_wq(struct mlx5_core_dev *dev) void mlx5_drain_health_recovery(struct mlx5_core_dev *dev) { struct mlx5_core_health *health = &dev->priv.health; + unsigned long flags; - spin_lock(&health->wq_lock); + spin_lock_irqsave(&health->wq_lock, flags); set_bit(MLX5_DROP_NEW_RECOVERY_WORK, &health->flags); - spin_unlock(&health->wq_lock); + spin_unlock_irqrestore(&health->wq_lock, flags); cancel_delayed_work_sync(&dev->priv.health.recover_work); } |