netdev - [PATCH] can: Use common error handling code in vxcan

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Message-ID: <2e600d9a-faec-dd39-08f0-5a7fb260d7ca@users.sourceforge.net>
Date:   Fri, 27 Oct 2017 22:30:10 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Wolfgang Grandegger <wg@...ndegger.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] can: Use common error handling code in vxcan_newlink()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Fri, 27 Oct 2017 22:22:24 +0200

* Add a jump target so that a bit of exception handling can be better
  reused at the end of this function.

* Adjust two condition checks.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/net/can/vxcan.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/net/can/vxcan.c b/drivers/net/can/vxcan.c
index 8404e8852a0f..97f250cbc4ff 100644
--- a/drivers/net/can/vxcan.c
+++ b/drivers/net/can/vxcan.c
@@ -227,10 +227,8 @@ static int vxcan_newlink(struct net *net, struct net_device *dev,
 	netif_carrier_off(peer);
 
 	err = rtnl_configure_link(peer, ifmp);
-	if (err < 0) {
-		unregister_netdevice(peer);
-		return err;
-	}
+	if (err)
+		goto unregister_network_device;
 
 	/* register first device */
 	if (tb[IFLA_IFNAME])
@@ -239,10 +237,8 @@ static int vxcan_newlink(struct net *net, struct net_device *dev,
 		snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
 
 	err = register_netdevice(dev);
-	if (err < 0) {
-		unregister_netdevice(peer);
-		return err;
-	}
+	if (err)
+		goto unregister_network_device;
 
 	netif_carrier_off(dev);
 
@@ -254,6 +250,10 @@ static int vxcan_newlink(struct net *net, struct net_device *dev,
 	rcu_assign_pointer(priv->peer, dev);
 
 	return 0;
+
+unregister_network_device:
+	unregister_netdevice(peer);
+	return err;
 }
 
 static void vxcan_dellink(struct net_device *dev, struct list_head *head)
-- 
2.14.3