From: Stefan Raspl <raspl@linux.ibm.com>
Subject: net/smc: adjust net_device refcount
Patch-mainline: v4.14-rc2
Git-commit: a6832c3acdb2ceb099ec3c385777fbaa6d5a5fd6
References: FATE#325694, LTC#167874, bsc#1113480

Summary:     net/smc: SMC-R MVP
Description: Add latest upstream patches to push SMC-R to the MVP level

Upstream-Description:

             net/smc: adjust net_device refcount

             smc_pnet_fill_entry() uses dev_get_by_name() adding a refcount to ndev.
             The following smc_pnet_enter() has to reduce the refcount if the entry
             to be added exists already in the pnet table.

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

Signed-off-by: Stefan Raspl <raspl@linux.ibm.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 net/smc/smc_pnet.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/smc/smc_pnet.c
+++ b/net/smc/smc_pnet.c
@@ -181,8 +181,10 @@ static int smc_pnet_enter(struct smc_pne
 			     sizeof(new_pnetelem->ndev->name)) ||
 		    smc_pnet_same_ibname(pnetelem,
 					 new_pnetelem->smcibdev->ibdev->name,
-					 new_pnetelem->ib_port))
+					 new_pnetelem->ib_port)) {
+			dev_put(pnetelem->ndev);
 			goto found;
+		}
 	}
 	list_add_tail(&new_pnetelem->list, &smc_pnettable.pnetlist);
 	rc = 0;