From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Sun, 30 Aug 2015 02:11:21 +0000 (-0700)
Subject: SUNRPC: Prevent SYN+SYNACK+RST storms
X-Git-Tag: firefly_0821_release~176^2~1127^2~17
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=099392048cd443349c50310f7fdc96070e40f4e7;p=firefly-linux-kernel-4.4.55.git

SUNRPC: Prevent SYN+SYNACK+RST storms

Add a shutdown() call before we release the socket in order to ensure the
reset is sent before we try to reconnect.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
---

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 214ca9dfb14e..7be90bc1a7c2 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -822,6 +822,8 @@ static void xs_reset_transport(struct sock_xprt *transport)
 	if (atomic_read(&transport->xprt.swapper))
 		sk_clear_memalloc(sk);
 
+	kernel_sock_shutdown(sock, SHUT_RDWR);
+
 	write_lock_bh(&sk->sk_callback_lock);
 	transport->inet = NULL;
 	transport->sock = NULL;