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svcrdma: do not unregister device for listeners

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commit 750037aa0a upstream.

On an rdma-capable machine, a start/stop/start and then on a stop of
a knfsd server would lead kref underflow warning because svc_rdma_free
would indiscriminately unregister the rdma device but a listening
transport never calls the rdma_rn_register() thus leading to kref
going down to 0 on the 1st stop of the server and on the 2nd stop
it leads to a problem.

Suggested-by: Chuck Lever <chuck.lever@oracle.com>
Fixes: c4de97f7c4 ("svcrdma: Handle device removal outside of the CM event handler")
Signed-off-by: Olga Kornievskaia <okorniev@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Olga Kornievskaia
2025-02-06 13:15:34 -05:00
committed by Greg Kroah-Hartman
parent f3cb81cb96
commit fbda9cac1b
1 changed files with 2 additions and 1 deletions
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net/sunrpc/xprtrdma/svc_rdma_transport.c
+2 -1
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@@ -621,7 +621,8 @@ static void __svc_rdma_free(struct work_struct *work)
/* Destroy the CM ID */
rdma_destroy_id(rdma->sc_cm_id);
rpcrdma_rn_unregister(device, &rdma->sc_rn);
if (!test_bit(XPT_LISTENER, &rdma->sc_xprt.xpt_flags))
rpcrdma_rn_unregister(device, &rdma->sc_rn);
kfree(rdma);
}