[PATCH] powerpc: fix dcr_unmap()

[Benjamin Herrenschmidt]

On Wed, 2007-03-28 at 11:07 +0100, Jean-Christophe Dubois wrote:
> Fix a bug in dcr_unmap(). 
> 
> At unmap time the DCR offset need to be added instead of substracted.
> 
> Signed-off-by: Jean-Christophe Dubois <jdubois at mc.com>

Acked-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
---

If possible that should go in 2.6.21

> Index: linux-2.6.20/arch/powerpc/sysdev/dcr.c
> ===================================================================
> --- linux-2.6.20.orig/arch/powerpc/sysdev/dcr.c
> +++ linux-2.6.20/arch/powerpc/sysdev/dcr.c
> @@ -129,7 +129,7 @@ void dcr_unmap(dcr_host_t host, unsigned
>  
>  	if (h.token == NULL)
>  		return;
> -	h.token -= dcr_n * h.stride;
> +	h.token += dcr_n * h.stride;
>  	iounmap(h.token);
>  	h.token = NULL;
>  }
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