SUNRPC: Micro optimisation for svc_data_ready

Don't call svc_xprt_enqueue() if the XPT_DATA flag is already set.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 0313470..338d6fe 100644 (file)
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -409,8 +409,8 @@ static void svc_data_ready(struct sock *sk)
                        svsk, sk,
                        test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
                svsk->sk_odata(sk);
-               set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
-               svc_xprt_enqueue(&svsk->sk_xprt);
+               if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags))
+                       svc_xprt_enqueue(&svsk->sk_xprt);
        }
 }