ethtool: Change ethtool_op_set_flags to validate flags

ethtool_op_set_flags() does not check for unsupported flags, and has
no way of doing so.  This means it is not suitable for use as a
default implementation of ethtool_ops::set_flags.

Add a 'supported' parameter specifying the flags that the driver and
hardware support, validate the requested flags against this, and
change all current callers to pass this parameter.

Change some other trivial implementations of ethtool_ops::set_flags to
call ethtool_op_set_flags().

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Reviewed-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 10 deletions

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 7985165e84fc..c762c6ac055b 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -4188,17 +4188,13 @@ static int sky2_set_eeprom(struct net_device *dev, struct ethtool_eeprom *eeprom
 static int sky2_set_flags(struct net_device *dev, u32 data)
 {
         struct sky2_port *sky2 = netdev_priv(dev);
+        u32 supported =
+                (sky2->hw->flags & SKY2_HW_RSS_BROKEN) ? 0 : ETH_FLAG_RXHASH;
+        int rc;
 
-        if (data & ~ETH_FLAG_RXHASH)
-                return -EOPNOTSUPP;
-
-        if (data & ETH_FLAG_RXHASH) {
-                if (sky2->hw->flags & SKY2_HW_RSS_BROKEN)
-                        return -EINVAL;
-
-                dev->features |= NETIF_F_RXHASH;
-        } else
-                dev->features &= ~NETIF_F_RXHASH;
+        rc = ethtool_op_set_flags(dev, data, supported);
+        if (rc)
+                return rc;
 
         rx_set_rss(dev);