netdev - [PATCH net] net/core: revert "net: fix __netdev_update

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Message-Id: <1447771746-17943-1-git-send-email-razor@blackwall.org>
Date:	Tue, 17 Nov 2015 15:49:06 +0100
From:	Nikolay Aleksandrov <razor@...ckwall.org>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net,
	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
	Michał Mirosław <mirq-linux@...e.qmqm.pl>
Subject: [PATCH net] net/core: revert "net: fix __netdev_update_features return.." and add comment

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

This reverts commit 00ee59271777 ("net: fix __netdev_update_features return
on ndo_set_features failure")
and adds a comment explaining why it's okay to return a value other than
0 upon error. Some drivers might actually change flags and return an
error so it's better to fire a spurious notification rather than miss
these.

CC: Michał Mirosław <mirq-linux@...e.qmqm.pl>
Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
---
Thanks to Michal for the explanation on why it was made to act like that.
Also sorry for the noise, unfortunately I missed this. IMO this should've
been an all or nothing op from the beginning.

 net/core/dev.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 5dbc86ea6b58..ae00b894e675 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6436,7 +6436,10 @@ int __netdev_update_features(struct net_device *dev)
 		netdev_err(dev,
 			"set_features() failed (%d); wanted %pNF, left %pNF\n",
 			err, &features, &dev->features);
-		return 0;
+		/* return non-0 since some features might have changed and
+		 * it's better to fire a spurious notification than miss it
+		 */
+		return -1;
 	}
 
 sync_lower:
-- 
2.4.3

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