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RDMA/mlx5: Drain RCU callbacks during module teardown

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devx_free_subscription() can remain queued after the last DevX event file
drops its module reference or an auxiliary driver detaches its devices.
mlx5_ib can then unload before the callback runs.

Registration error unwind has the same risk because driver registration
can attach existing devices before failing. Wait after all drivers have
stopped.

Fixes: 6898d1c661 ("RDMA/mlx5: Use RCU and direct refcounts to keep memory alive")
Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Closes: https://lore.kernel.org/linux-rdma/20260708092316.Qb39F_B0@linutronix.de/
Link: https://patch.msgid.link/20260709-unload-rcu-v1-2-fccd27211e5a@nvidia.com
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
This commit is contained in:
Leon Romanovsky 2026-07-12 04:37:36 -04:00
parent 7d75592114
commit e37cdd75f8
1 changed files with 2 additions and 0 deletions
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2
drivers/infiniband/hw/mlx5/main.c
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@ -5538,6 +5538,7 @@ static int __init mlx5_ib_init(void)
dd_err:
mlx5r_rep_cleanup();
rep_err:
rcu_barrier();
mlx5_ib_qp_event_cleanup();
qp_event_err:
destroy_workqueue(mlx5_ib_event_wq);
@ -5551,6 +5552,7 @@ static void __exit mlx5_ib_cleanup(void)
auxiliary_driver_unregister(&mlx5r_driver);
auxiliary_driver_unregister(&mlx5r_mp_driver);
mlx5r_rep_cleanup();
rcu_barrier();
mlx5_ib_qp_event_cleanup();
destroy_workqueue(mlx5_ib_event_wq);