netdev - Re: [RESENT PATCH] net: tuntap: Fix tun_net_fix

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Date:	Mon, 20 Jun 2011 20:25:06 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:	netdev@...r.kernel.org, Herbert Xu <herbert@...dor.apana.org.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Shan Wei <shanwei@...fujitsu.com>
Subject: Re: [RESENT PATCH] net: tuntap: Fix tun_net_fix_features()

On Mon, 2011-06-20 at 21:14 +0200, Michał Mirosław wrote:
> tun->set_features are meant to limit not force the features.
>
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> Acked-by: Michael S. Tsirkin <mst@...hat.com>
> 
> ---
>  drivers/net/tun.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index 4dab85e..56981c2 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -458,7 +458,7 @@ static u32 tun_net_fix_features(struct net_device *dev, u32 features)
>  {
>  	struct tun_struct *tun = netdev_priv(dev);
>  
> -	return (features & tun->set_features) | (features & ~TUN_USER_FEATURES);
> +	return features & (tun->set_features | ~TUN_USER_FEATURES);

(A & B) | (A & C) <=> A & (B | C)

This is a cosmetic change, not a fix.  Maybe you think it is clearer but
then you should say that in the commit message.

Ben.

>  }
>  
>  static const struct net_device_ops tun_netdev_ops = {

-- 
Ben Hutchings, Senior Software Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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