From: Jeff Garzik Date: Fri, 26 Feb 2010 21:43:38 +0000 (+0000) Subject: ethtool: do not set some flags, if others failed X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9675478bbafed08848bf8d7e28400d5e46330b23;p=linux-beck.git 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 Signed-off-by: David S. Miller --- 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; }