From: Hans Wippel <hwippel@linux.vnet.ibm.com>
Date: Thu, 21 Sep 2017 07:16:27 +0000 (+0200)
Subject: net/smc: add receive timeout check
X-Git-Tag: v4.14-rc2~10^2~5^2~7
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=846e344eb7229018457d6d6fc1ab0cc0a167692f;p=platform%2Fkernel%2Flinux-rpi3.git

net/smc: add receive timeout check

The SMC receive function currently lacks a timeout check under the
condition that no data were received and no data are available. This
patch adds such a check.

Signed-off-by: Hans Wippel <hwippel@linux.vnet.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/smc/smc_rx.c b/net/smc/smc_rx.c
index b17a333..3e631ae 100644
--- a/net/smc/smc_rx.c
+++ b/net/smc/smc_rx.c
@@ -148,6 +148,8 @@ int smc_rx_recvmsg(struct smc_sock *smc, struct msghdr *msg, size_t len,
 				read_done = sock_intr_errno(timeo);
 				break;
 			}
+			if (!timeo)
+				return -EAGAIN;
 		}
 
 		if (!atomic_read(&conn->bytes_to_rcv)) {