Merge branch 'fixes-2.6.39' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

[mirror_ubuntu-artful-kernel.git] / net / core / ethtool.c

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 24bd57493c0d602d38259b6111a6780611ca46fd..74ead9eca126cd99121f3bb581e5bb7359c0406e 100644 (file)
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -141,9 +141,24 @@ u32 ethtool_op_get_flags(struct net_device *dev)
 }
 EXPORT_SYMBOL(ethtool_op_get_flags);
 
+/* Check if device can enable (or disable) particular feature coded in "data"
+ * argument. Flags "supported" describe features that can be toggled by device.
+ * If feature can not be toggled, it state (enabled or disabled) must match
+ * hardcoded device features state, otherwise flags are marked as invalid.
+ */
+bool ethtool_invalid_flags(struct net_device *dev, u32 data, u32 supported)
+{
+       u32 features = dev->features & flags_dup_features;
+       /* "data" can contain only flags_dup_features bits,
+        * see __ethtool_set_flags */
+
+       return (features & ~supported) != (data & ~supported);
+}
+EXPORT_SYMBOL(ethtool_invalid_flags);
+
 int ethtool_op_set_flags(struct net_device *dev, u32 data, u32 supported)
 {
-       if (data & ~supported)
+       if (ethtool_invalid_flags(dev, data, supported))
                return -EINVAL;
 
        dev->features = ((dev->features & ~flags_dup_features) |