linux-kernel - Re: [PATCH 1/3] drivers/isdn/hisax: Correct use of request_region/request_mem

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Date:	Sun, 9 Aug 2009 11:51:14 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Karsten Keil <isdn@...ux-pingi.de>,
	isdn4linux@...tserv.isdn4linux.de, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/3] drivers/isdn/hisax: Correct use of
 request_region/request_mem_region

Or perhaps it is the request_region that is incorrect, since the same 
value is later used with ioremap?

julia


On Sun, 9 Aug 2009, Julia Lawall wrote:

> From: Julia Lawall <julia@...u.dk>
> 
> request_region should be used with release_region, not request_mem_region.
> 
> The semantic patch that fixes this problem is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @r1@
> expression start;
> @@
> 
> request_region(start,...)
> 
> @b1@
> expression r1.start;
> @@
> 
> request_mem_region(start,...)
> 
> @depends on !b1@
> expression r1.start;
> expression E;
> @@
> 
> - release_mem_region
> + release_region
>   (start,E)
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
>  drivers/isdn/hisax/isurf.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff -u -p a/drivers/isdn/hisax/isurf.c b/drivers/isdn/hisax/isurf.c
> --- a/drivers/isdn/hisax/isurf.c
> +++ b/drivers/isdn/hisax/isurf.c
> @@ -125,7 +125,7 @@ release_io_isurf(struct IsdnCardState *c
>  {
>  	release_region(cs->hw.isurf.reset, 1);
>  	iounmap(cs->hw.isurf.isar);
> -	release_mem_region(cs->hw.isurf.phymem, ISURF_IOMEM_SIZE);
> +	release_region(cs->hw.isurf.phymem, ISURF_IOMEM_SIZE);
>  }
>  
>  static void
> 
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