netdev - Re: [PATCH net-next 3/6] 6lowpan: introduce lowpan_fetch

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Message-ID: <20130814114921.GC2010@order.stressinduktion.org>
Date:	Wed, 14 Aug 2013 13:49:21 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Alexander Aring <alex.aring@...il.com>
Cc:	alex.bluesman.smirnov@...il.com, dbaryshkov@...il.com,
	davem@...emloft.net, linux-zigbee-devel@...ts.sourceforge.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next 3/6] 6lowpan: introduce lowpan_fetch_skb function

On Wed, Aug 14, 2013 at 01:01:45PM +0200, Alexander Aring wrote:
> This patch adds a helper function to parse the ipv6 header to a
> 6lowpan header in stream.
> 
> This function checks first if we can pull data with a specific
> length from a skb. If this seems to be okay, we copy skb data to
> a destination pointer and run skb_pull.
> 
> Signed-off-by: Alexander Aring <alex.aring@...il.com>
> Reviewed-by: Werner Almesberger <werner@...esberger.net>
> ---
>  net/ieee802154/6lowpan.h | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/net/ieee802154/6lowpan.h b/net/ieee802154/6lowpan.h
> index 61f0ce9..e3348ec 100644
> --- a/net/ieee802154/6lowpan.h
> +++ b/net/ieee802154/6lowpan.h
> @@ -233,4 +233,16 @@
>  					dest = 16 bit inline */
>  #define LOWPAN_NHC_UDP_CS_P_11	0xF3 /* source & dest = 0xF0B + 4bit inline */
>  
> +static inline bool lowpan_fetch_skb(struct sk_buff *skb,
> +		void *data, const unsigned int len)
> +{
> +	if (unlikely(!pskb_may_pull(skb, len)))
> +		return true;
> +
> +	skb_copy_from_linear_data(skb, data, len);
> +	skb_pull(skb, len);
> +
> +	return false;
> +}

Isn't the return value inverted here?

Greetings,

  Hannes

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