[PATCH net-next] net/smc: return ETIMEDOUT when smc_connect_clc() timeout

["D. Wythe" <alibuda@linux.alibaba.com>]

From: "D. Wythe" <alibuda@linux.alibaba.com>

When smc_connect_clc() times out, it will return -EAGAIN(tcp_recvmsg
retuns -EAGAIN while timeout), then this value will passed to the
application, which is quite confusing to the applications, makes
inconsistency with TCP.

From the manual of connect, ETIMEDOUT is more suitable, and this patch
try convert EAGAIN to ETIMEDOUT in that case.

Signed-off-by: D. Wythe <alibuda@linux.alibaba.com>
---
 net/smc/af_smc.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 246c874..38a4064 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1372,8 +1372,14 @@ static int __smc_connect(struct smc_sock *smc)
 
 	/* perform CLC handshake */
 	rc = smc_connect_clc(smc, aclc2, ini);
-	if (rc)
+	if (rc) {
+		/* -EAGAIN on timeout, see tcp_recvmsg() */
+		if (rc == -EAGAIN) {
+			rc = -ETIMEDOUT;
+			smc->sk.sk_err = ETIMEDOUT;
+		}
 		goto vlan_cleanup;
+	}
 
 	/* check if smc modes and versions of CLC proposal and accept match */
 	rc = smc_connect_check_aclc(ini, aclc);
-- 
1.8.3.1