netdev - Re: [PATCH net] mscan: zero accidentally copied register content

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Message-ID: <4E8DF294.7060707@pengutronix.de>
Date:	Thu, 06 Oct 2011 20:25:24 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Oliver Hartkopp <socketcan@...tkopp.net>
CC:	Wolfgang Grandegger <wg@...ndegger.com>,
	Wolfram Sang <w.sang@...gutronix.de>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Andre Naujoks <nautsch@...il.com>
Subject: Re: [PATCH net] mscan: zero accidentally copied register content

On 10/05/2011 05:34 PM, Oliver Hartkopp wrote:
> Due to the 16 bit access to mscan registers there's too much data copied to
> the zero initialized CAN frame when having an odd number of bytes to copy.
> This patch clears the data byte read from the invalid register entry.
> 
> Reported-by: Andre Naujoks <nautsch@...il.com>
> Signed-off-by: Oliver Hartkopp <socketcan@...tkopp.net>

This problem have some other drivers, too, e.g. the at91 and the flexcan
driver both copy unconditionally all 8 bytes from the hardware. However,
I don't know if the hardware sets the remaining bytes to zero.

cheers, Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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