linux-kernel - [PATCH 3.2 12/77] net: fix __netdev_update_features return on ndo_set

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Message-ID: <lsq.1450971462.91697377@decadent.org.uk>
Date:	Thu, 24 Dec 2015 15:37:42 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Nikolay Aleksandrov" <nikolay@...ulusnetworks.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Michał Mirosław" 
	<mirq-linux@...e.qmqm.pl>
Subject: [PATCH 3.2 12/77] net: fix __netdev_update_features return on
 ndo_set_features failure

3.2.75-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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

commit 00ee5927177792a6e139d50b6b7564d35705556a upstream.

If ndo_set_features fails __netdev_update_features() will return -1 but
this is wrong because it is expected to return 0 if no features were
changed (see netdev_update_features()), which will cause a netdev
notifier to be called without any actual changes. Fix this by returning
0 if ndo_set_features fails.

Fixes: 6cb6a27c45ce ("net: Call netdev_features_change() from netdev_update_features()")
CC: Michał Mirosław <mirq-linux@...e.qmqm.pl>
Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/core/dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5446,7 +5446,7 @@ int __netdev_update_features(struct net_
 		netdev_err(dev,
 			"set_features() failed (%d); wanted 0x%08x, left 0x%08x\n",
 			err, features, dev->features);
-		return -1;
+		return 0;
 	}
 
 	if (!err)

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