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RDMA/ipoib: Drain RCU callbacks during module teardown

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IPoIB reclamation completions can be signaled from inside an RCU callback.
Teardown can wake before the callback returns and unload ib_ipoib while its
code is still executing.

Client registration failure can also remove already-added devices and queue
callbacks. Wait after client and workqueue teardown.

Fixes: b63b70d877 ("IPoIB: Use a private hash table for path lookup in xmit path")
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-v1-3-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 e37cdd75f8
commit 31b7c70067
1 changed files with 2 additions and 0 deletions
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2
drivers/infiniband/ulp/ipoib/ipoib_main.c
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@ -2783,6 +2783,7 @@ static int __init ipoib_init_module(void)
err_sa:
ib_sa_unregister_client(&ipoib_sa_client);
destroy_workqueue(ipoib_workqueue);
rcu_barrier();
err_fs:
ipoib_unregister_debugfs();
@ -2800,6 +2801,7 @@ static void __exit ipoib_cleanup_module(void)
ib_sa_unregister_client(&ipoib_sa_client);
ipoib_unregister_debugfs();
destroy_workqueue(ipoib_workqueue);
rcu_barrier();
}
module_init(ipoib_init_module);