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[PATCH 3.2 39/70] net/core: revert "net: fix __netdev_update_features return.." and add comment

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  [PATCH 3.2 39/70] net/core: revert "net: fix __netdev_update_features  return.." and add comment Ben Hutchings <ben@decadent.org.uk> - 2016-01-18 04:40 +0100

#1311288 — [PATCH 3.2 39/70] net/core: revert "net: fix __netdev_update_features return.." and add comment

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

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

From: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>

commit 17b85d29e82cc3c874a497a8bc5764d6a2b043e2 upstream.

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@rere.qmqm.pl>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 net/core/dev.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5446,7 +5446,10 @@ 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 0;
+		/* return non-0 since some features might have changed and
+		 * it's better to fire a spurious notification than miss it
+		 */
+		return -1;
 	}
 
 	if (!err)

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