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authorJeff Garzik <jeff@garzik.org>2010-02-26 21:43:38 +0000
committerDavid S. Miller <davem@davemloft.net>2010-02-28 01:40:30 -0800
commit9675478bbafed08848bf8d7e28400d5e46330b23 (patch)
treee6657e754b88ddc7074aae790510b23d93180308 /net/core
parent6c74651c3bce418d3b29edfdeb72664f9441509a (diff)
downloadlinux-9675478bbafed08848bf8d7e28400d5e46330b23.tar.bz2
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>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/ethtool.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 31b1eddc1b84..0f2f82185ec4 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -135,21 +135,23 @@ u32 ethtool_op_get_flags(struct net_device *dev)
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;
}