From: Chuck Lever <chuck.lever@oracle.com>
Date: Thu, 14 Dec 2017 20:56:18 -0500
Subject: xprtrdma: Eliminate unnecessary lock cycle in xprt_rdma_send_request
Patch-mainline: v4.16-rc1
Git-commit: 42b9f5c58aa8c59c91ead0254f0c193e3438b020
References: bsc#1103992 FATE#326009

The rpcrdma_req is not shared yet, and its associated Send hasn't
been posted, thus RMW should be safe. There's no need for the
expense of a lock cycle here.

Fixes: 0ba6f37012db ("xprtrdma: Refactor rpcrdma_deferred_completion")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/sunrpc/xprtrdma/transport.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/sunrpc/xprtrdma/transport.c
+++ b/net/sunrpc/xprtrdma/transport.c
@@ -735,7 +735,7 @@ xprt_rdma_send_request(struct rpc_task *
 		goto drop_connection;
 	req->rl_connect_cookie = xprt->connect_cookie;
 
-	set_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags);
+	__set_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags);
 	if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
 		goto drop_connection;