netdev - Re: [PATCH] GRE: Use IS_ERR_OR_NULL in gre_gso

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Date:	Fri, 19 Apr 2013 03:24:33 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Simon Horman <horms@...ge.net.au>
Cc:	netdev@...r.kernel.org, Dmitry Kozlov <xeb@...l.ru>
Subject: Re: [PATCH] GRE: Use IS_ERR_OR_NULL in gre_gso_segment

On Fri, 2013-04-19 at 15:48 +0900, Simon Horman wrote:
> Signed-off-by: Simon Horman <horms@...ge.net.au>
> ---
>  net/ipv4/gre.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/ipv4/gre.c b/net/ipv4/gre.c
> index d2d5a99..0ae998b 100644
> --- a/net/ipv4/gre.c
> +++ b/net/ipv4/gre.c
> @@ -168,7 +168,7 @@ static struct sk_buff *gre_gso_segment(struct sk_buff *skb,
>  	/* segment inner packet. */
>  	enc_features = skb->dev->hw_enc_features & netif_skb_features(skb);
>  	segs = skb_mac_gso_segment(skb, enc_features);
> -	if (!segs || IS_ERR(segs))
> +	if (IS_ERR_OR_NULL(segs))
>  		goto out;
>  
>  	skb = segs;

Hi Simon

AFAIK I would change things so that NULL is not a possible value.

I don't really like IS_ERR_OR_NULL() because it hides some lazyness of
ours, and is more expensive (2 tests)

If we return NULL for an error, why not instead return -Esomething,
since caller is OK to get -ENOMEM,-Exxxxx,... ?

Anyway I presume this is a net-next patch ?

Thanks



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