* [PATCH] ethtool: do not set some flags, if others failed
@ 2010-02-27 7:43 Jeff Garzik
2010-02-28 9:40 ` David Miller
0 siblings, 1 reply; 2+ messages in thread
From: Jeff Garzik @ 2010-02-27 7:43 UTC (permalink / raw)
To: netdev
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>
---
net/core/ethtool.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
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 @@ 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;
}
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] ethtool: do not set some flags, if others failed
2010-02-27 7:43 [PATCH] ethtool: do not set some flags, if others failed Jeff Garzik
@ 2010-02-28 9:40 ` David Miller
0 siblings, 0 replies; 2+ messages in thread
From: David Miller @ 2010-02-28 9:40 UTC (permalink / raw)
To: jeff; +Cc: netdev
From: Jeff Garzik <jeff@garzik.org>
Date: Sat, 27 Feb 2010 02:43:38 -0500
>
> 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>
Applied, thanks Jeff.
^ permalink raw reply [flat|nested] 2+ messages in thread
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