netdev - [PATCH net] net: fix feature changes on devices without ndo_set

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Message-Id: <1447422841-2333-1-git-send-email-razor@blackwall.org>
Date:	Fri, 13 Nov 2015 14:54:01 +0100
From:	Nikolay Aleksandrov <razor@...ckwall.org>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net,
	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
	Jarod Wilson <jarod@...hat.com>, Jiri Pirko <jiri@...nulli.us>,
	Ido Schimmel <idosch@...lanox.com>,
	Sander Eikelenboom <linux@...elenboom.it>,
	Andy Gospodarek <gospo@...ulusnetworks.com>,
	Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH net] net: fix feature changes on devices without ndo_set_features

From: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>

When __netdev_update_features() was updated to ensure some features are
disabled on new lower devices, an error was introduced for devices which
don't have the ndo_set_features() method set. Before we'll just set the
new features, but now we return an error and don't set them. Fix this by
returning the old behaviour and setting err to 0 when ndo_set_features
is not present.

Fixes: e7868a85e1b2 ("net/core: ensure features get disabled on new lower devs")
CC: Jarod Wilson <jarod@...hat.com>
CC: Jiri Pirko <jiri@...nulli.us>
CC: Ido Schimmel <idosch@...lanox.com>
CC: Sander Eikelenboom <linux@...elenboom.it>
CC: Andy Gospodarek <gospo@...ulusnetworks.com>
CC: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
---
Sander please feel free to give your Tested-by.

 net/core/dev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index ab9b8d0d115e..4a1d198dbbff 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6426,6 +6426,8 @@ int __netdev_update_features(struct net_device *dev)
 
 	if (dev->netdev_ops->ndo_set_features)
 		err = dev->netdev_ops->ndo_set_features(dev, features);
+	else
+		err = 0;
 
 	if (unlikely(err < 0)) {
 		netdev_err(dev,
-- 
2.4.3

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