From: Hans Wippel <hwippel@linux.vnet.ibm.com>
Date: Thu, 21 Sep 2017 09:16:26 +0200
Subject: net/smc: add missing dev_put
Patch-mainline: v4.14-rc2
Git-commit: 09579ac803a3638344b8544b5940793d5358673e
References: bsc#1103992 FATE#326009

In the infiniband part, SMC currently uses get_netdev which calls
dev_hold on the returned net device. However, the SMC code never calls
dev_put on that net device resulting in a wrong reference count.

This patch adds a dev_put after the usage of the net device to fix the
issue.

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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/smc/smc_ib.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/smc/smc_ib.c
+++ b/net/smc/smc_ib.c
@@ -296,6 +296,7 @@ static int smc_ib_fill_gid_and_mac(struc
 	ndev = smcibdev->ibdev->get_netdev(smcibdev->ibdev, ibport);
 	if (ndev) {
 		memcpy(&smcibdev->mac, ndev->dev_addr, ETH_ALEN);
+		dev_put(ndev);
 	} else if (!rc) {
 		memcpy(&smcibdev->mac[ibport - 1][0],
 		       &smcibdev->gid[ibport - 1].raw[8], 3);