linux-kernel - Re: [PATCH 4/20 V2] drivers/net/can/sja1000/peak

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Date:	Fri, 05 Oct 2012 23:07:06 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Peter Senna Tschudin <peter.senna@...il.com>
CC:	wg@...ndegger.com, linux@...inikbrodowski.net,
	linux-can@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 4/20 V2] drivers/net/can/sja1000/peak_pcmcia.c: fix error
 return code

On 10/05/2012 10:41 PM, Peter Senna Tschudin wrote:
> From: Peter Senna Tschudin <peter.senna@...il.com>
> 
> The function pcan_probe() return 0 for success and negative value
> for most of its internal tests failures. There is one exception
> that is error case going to probe_err_4:. Fore this error case, the
> function abort its success execution path but returns non negative
> value, making it difficult for a caller function to notice the error.
> 
> This patch fixes the error case that do not return negative value.
> 
> This was found by Coccinelle, but the code change was made by hand.
> This patch is not robot generated.
> 
> A simplified version of the semantic match that finds this problem is
> as follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> (
> if@p1 (\(ret < 0\|ret != 0\))
>  { ... return ret; }
> |
> ret@p1 = 0
> )
> ... when != ret = e1
>     when != &ret
> *if(...)
> {
>   ... when != ret = e2
>       when forall
>  return ret;
> }
> // </smpl>
> 
> Signed-off-by: Peter Senna Tschudin <peter.senna@...il.com>


Too late, v1 of this patch is already in net/master

regards, Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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