netdev - Re: [PATCH v2] can: provide library functions for skb allocation

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Date:	Mon, 19 Oct 2009 21:54:40 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	wg@...ndegger.com
Cc:	netdev@...r.kernel.org, socketcan-core@...ts.berlios.de,
	haas@...-wuensche.com, anantgole@...com, mkl@...gutronix.de
Subject: Re: [PATCH v2] can: provide library functions for skb allocation

From: Wolfgang Grandegger <wg@...ndegger.com>
Date: Sun, 18 Oct 2009 20:45:23 +0200

> This patch makes the private functions alloc_can_skb() and
> alloc_can_err_skb() of the at91_can driver public and adapts all
> drivers to use these. While making the patch I realized, that
> the skb's are *not* setup consistently. It's now done as shown
> below:
> 
>   skb->protocol = htons(ETH_P_CAN);
>   skb->pkt_type = PACKET_BROADCAST;
>   skb->ip_summed = CHECKSUM_UNNECESSARY;
>   *cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
>   memset(*cf, 0, sizeof(struct can_frame));
> 
> The frame is zeroed out to avoid uninitialized data to be passed to
> user space. Some drivers or library code did not set "pkt_type" or 
> "ip_summed". Also,  "__constant_htons()" should not be used for
> runtime invocations, as pointed out by David Miller.
> 
> Signed-off-by: Wolfgang Grandegger <wg@...ndegger.com>

Applied, thanks.
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