linux-kernel - Re: [PATCH 4/4] drivers/atm/idt77252.c: Remove unnecessary error check

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Date:	Sat, 02 Oct 2010 16:09:42 +0200
From:	walter harms <wharms@....de>
To:	Julia Lawall <julia@...u.dk>
CC:	Chas Williams <chas@....nrl.navy.mil>,
	kernel-janitors@...r.kernel.org,
	linux-atm-general@...ts.sourceforge.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] drivers/atm/idt77252.c: Remove unnecessary error
 check



Julia Lawall schrieb:
> This code does not call deinit_card(card); in an error case, as done in
> other error-handling code in the same function.  But actually, the called
> function init_sram can only return 0, so there is no need for the error
> check at all.
> 


did you set init_sram() to void ?
re,
 wh




> A simplified version of the sematic match that finds this problem is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @r exists@
> @r@
> statement S1,S2,S3;
> constant C1,C2,C3;
> @@
> 
> *if (...)
>  {... S1 return -C1;}
> ...
> *if (...)
>  {... when != S1
>     return -C2;}
> ...
> *if (...)
>  {... S1 return -C3;}
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
>  drivers/atm/idt77252.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/atm/idt77252.c b/drivers/atm/idt77252.c
> index 1679cbf..08ccde6 100644
> --- a/drivers/atm/idt77252.c
> +++ b/drivers/atm/idt77252.c
> @@ -3410,8 +3410,7 @@ init_card(struct atm_dev *dev)
>  
>  	writel(readl(SAR_REG_CFG) | conf, SAR_REG_CFG);
>  
> -	if (init_sram(card) < 0)
> -		return -1;
> +	init_sram(card);
>  
>  /********************************************************************/
>  /*  A L L O C   R A M   A N D   S E T   V A R I O U S   T H I N G S */
> 
> --
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> 
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