ethtool: do not set some flags, if others failed
NETIF_F_NTUPLE flag setting introduced a bug: non-ntuple flags
like LRO may be successfully set, before ioctl(2) returns failure
to userspace.
The set-flags operation should be all-or-none, rather than leaving
things in an inconsistent state prior to reporting failure to
userspace.
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 31b1edd..0f2f821 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -135,21 +135,23 @@
int ethtool_op_set_flags(struct net_device *dev, u32 data)
{
const struct ethtool_ops *ops = dev->ethtool_ops;
+ unsigned long features = dev->features;
if (data & ETH_FLAG_LRO)
- dev->features |= NETIF_F_LRO;
+ features |= NETIF_F_LRO;
else
- dev->features &= ~NETIF_F_LRO;
+ features &= ~NETIF_F_LRO;
if (data & ETH_FLAG_NTUPLE) {
if (!ops->set_rx_ntuple)
return -EOPNOTSUPP;
- dev->features |= NETIF_F_NTUPLE;
+ features |= NETIF_F_NTUPLE;
} else {
/* safe to clear regardless */
- dev->features &= ~NETIF_F_NTUPLE;
+ features &= ~NETIF_F_NTUPLE;
}
+ dev->features = features;
return 0;
}