net: Fix disjunct computation of netdev features

My change

    commit e2a6b85247aacc52d6ba0d9b37a99b8d1a3e0d83
    net: Enable TSO if supported by at least one device

didn't do what was intended because the netdev_compute_features
function was designed for conjunctions.  So what happened was that
it would simply take the TSO status of the last constituent device.

This patch extends it to support both conjunctions and disjunctions
under the new name of netdev_increment_features.

It also adds a new function netdev_fix_features which does the
sanity checking that usually occurs upon registration.  This ensures
that the computation doesn't result in an illegal combination
since this checking is absent when the change is initiated via
ethtool.

The two users of netdev_compute_features have been converted.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 4 deletions

diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 573e20f7dba4..0a09ccf68c1c 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -347,15 +347,21 @@ int br_min_mtu(const struct net_bridge *br)
 void br_features_recompute(struct net_bridge *br)
 {
         struct net_bridge_port *p;
-        unsigned long features;
+        unsigned long features, mask;
 
-        features = br->feature_mask;
+        features = mask = br->feature_mask;
+        if (list_empty(&br->port_list))
+                goto done;
+
+        features &= ~NETIF_F_ONE_FOR_ALL;
 
         list_for_each_entry(p, &br->port_list, list) {
-                features = netdev_compute_features(features, p->dev->features);
+                features = netdev_increment_features(features,
+                                                     p->dev->features, mask);
         }
 
-        br->dev->features = features;
+done:
+        br->dev->features = netdev_fix_features(features, NULL);
 }
 
 /* called with RTNL */