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net/core: ensure features get disabled on new lower devs 

With moving netdev_sync_lower_features() after the .ndo_set_features
calls, I neglected to verify that devices added *after* a flag had been
disabled on an upper device were properly added with that flag disabled as
well. This currently happens, because we exit __netdev_update_features()
when we see dev->features == features for the upper dev. We can retain the
optimization of leaving without calling .ndo_set_features with a bit of
tweaking and a goto here.

Fixes: fd867d51f8 ("net/core: generic support for disabling netdev features down stack")
CC: "David S. Miller" <davem@davemloft.net>
CC: Eric Dumazet <edumazet@google.com>
CC: Jay Vosburgh <j.vosburgh@gmail.com>
CC: Veaceslav Falico <vfalico@gmail.com>
CC: Andy Gospodarek <gospo@cumulusnetworks.com>
CC: Jiri Pirko <jiri@resnulli.us>
CC: Nikolay Aleksandrov <razor@blackwall.org>
CC: Michal Kubecek <mkubecek@suse.cz>
CC: Alexander Duyck <alexander.duyck@gmail.com>
CC: netdev@vger.kernel.org
Reported-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Jarod Wilson 2015-11-03 23:09:32 -05:00 committed by David S. Miller
parent e1b8d903c6
commit e7868a85e1
1 changed files with 4 additions and 3 deletions
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7
net/core/dev.c
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@ -6402,7 +6402,7 @@ int __netdev_update_features(struct net_device *dev)
struct net_device *upper, *lower;
netdev_features_t features;
struct list_head *iter;
int err = 0;
int err = -1;
ASSERT_RTNL();
@ -6419,7 +6419,7 @@ int __netdev_update_features(struct net_device *dev)
features = netdev_sync_upper_features(dev, upper, features);
if (dev->features == features)
return 0;
goto sync_lower;
netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
&dev->features, &features);
@ -6434,6 +6434,7 @@ int __netdev_update_features(struct net_device *dev)
return -1;
}
sync_lower:
/* some features must be disabled on lower devices when disabled
* on an upper device (think: bonding master or bridge)
*/
@ -6443,7 +6444,7 @@ int __netdev_update_features(struct net_device *dev)
if (!err)
dev->features = features;
return 1;
return err < 0 ? 0 : 1;
}
/**