From: Chuck Lever <chuck.lever@oracle.com>
Date: Sat, 9 May 2020 14:07:13 -0400
Subject: [PATCH] SUNRPC: Signalled ASYNC tasks need to exit
Git-commit: ce99aa62e1eb793e259d023c7f6ccb7c4879917b
Patch-mainline: v5.7-rc6
References: git-fixes

Ensure that signalled ASYNC rpc_tasks exit immediately instead of
spinning until a timeout (or forever).

To avoid checking for the signal flag on every scheduler iteration,
the check is instead introduced in the client's finite state
machine.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Fixes: ae67bd3821bb ("SUNRPC: Fix up task signalling")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Acked-by: NeilBrown <neilb@suse.com>

---
 net/sunrpc/clnt.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -2412,6 +2412,11 @@ rpc_check_timeout(struct rpc_task *task)
 {
 	struct rpc_clnt	*clnt = task->tk_client;
 
+	if (RPC_SIGNALLED(task)) {
+		rpc_call_rpcerror(task, -ERESTARTSYS);
+		return;
+	}
+
 	if (xprt_adjust_timeout(task->tk_rqstp) == 0)
 		return;