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RDMA/core: Wait for RCU callbacks before unloading ib_core

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put_gid_ndev() is queued with call_rcu() and implemented in ib_core.
Stopping the workqueues does not drain callbacks already queued, so RCU
could invoke it after the module code has been unloaded.

synchronize_rcu() does not wait for callbacks. Wait for them after all
producers have stopped.

Fixes: 943bd984b1 ("RDMA/core: Allow detaching gid attribute netdevice for RoCE")
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-v1-1-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 04:37:35 -04:00
parent 3cda0dfe8c
commit 7d75592114
1 changed files with 1 additions and 0 deletions
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1
drivers/infiniband/core/device.c
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@ -3150,6 +3150,7 @@ static void __exit ib_core_cleanup(void)
/* Make sure that any pending umem accounting work is done. */
destroy_workqueue(ib_wq);
destroy_workqueue(ib_unreg_wq);
rcu_barrier();
WARN_ON(!xa_empty(&clients));
WARN_ON(!xa_empty(&devices));
}