[ Upstream commit 6377ed0bba ]
spin_lock/unlock of health->wq_lock should be IRQ safe.
It was changed to spin_lock_irqsave since adding commit 0179720d6b
("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: 2a0165a034 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5fdd520306