SUNRPC: add WARN_ON_ONCE for potential deadlock
rpc_shutdown_client should never be called from a workqueue context. If it is, it could deadlock looping forever trying to kill tasks that are assigned to the same kworker thread (and will never run rpc_exit_task). Signed-off-by: NWeston Andros Adamson <dros@netapp.com> Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
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