netdev - Re: [PATCH net-2.6] can: Fix data length code handling in rx path

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Date:	Sun, 13 Dec 2009 19:47:47 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	wg@...ndegger.com
Cc:	oliver@...tkopp.net, netdev@...r.kernel.org,
	socketcan-core@...ts.berlios.de
Subject: Re: [PATCH net-2.6] can: Fix data length code handling in rx path

From: Wolfgang Grandegger <wg@...ndegger.com>
Date: Sat, 12 Dec 2009 19:09:54 +0100

> Oliver Hartkopp wrote:
>> A valid CAN dataframe can have a data length code (DLC) of 0 .. 8 data bytes.
>> 
>> When reading the CAN controllers register the 4-bit value may contain values
>> from 0 .. 15 which may exceed the reserved space in the socket buffer!
>> 
>> The ISO 11898-1 Chapter 8.4.2.3 (DLC field) says that register values > 8
>> should be reduced to 8 without any error reporting or frame drop.
>> 
>> This patch introduces a new helper macro to cast a given 4-bit data length
>> code (dlc) to __u8 and ensure the DLC value to be max. 8 bytes.
>> 
>> The different handlings in the rx path of the CAN netdevice drivers are fixed.
>> 
>> Signed-off-by: Oliver Hartkopp <oliver@...tkopp.net>
> 
> Signed-off-by: Wolfgang Grandegger <wg@...ndegger.com>

Applied, thanks everyone.

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