[PATCH net-next] alx: fix missing unlock on error in alx_set_pauseparam()

[Pu Lehui]

Add the missing unlock before return from function alx_set_pauseparam()
in the error handling case.

Fixes: 4a5fe57e7751 ("alx: use fine-grained locking instead of RTNL")
Signed-off-by: Pu Lehui <pulehui@xxxxxxxxxx>
---
 drivers/net/ethernet/atheros/alx/ethtool.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/atheros/alx/ethtool.c b/drivers/net/ethernet/atheros/alx/ethtool.c
index f3627157a38a..b716adacd815 100644
--- a/drivers/net/ethernet/atheros/alx/ethtool.c
+++ b/drivers/net/ethernet/atheros/alx/ethtool.c
@@ -253,8 +253,10 @@ static int alx_set_pauseparam(struct net_device *netdev,
 
 	if (reconfig_phy) {
 		err = alx_setup_speed_duplex(hw, hw->adv_cfg, fc);
-		if (err)
+		if (err) {
+			mutex_unlock(&alx->mtx);
 			return err;
+		}
 	}
 
 	/* flow control on mac */
-- 
2.17.1