Re: [PATCH v5 2/5] ARM: sa1111: ensure no negative value gets returned on positive match

[Russell King - ARM Linux]

On Wed, Dec 23, 2015 at 11:59:25AM +0100, Marek Szyprowski wrote:
> This patch ensures that existing bus match callbacks don't return
> negative values (which might be interpreted as potential errors in the
> future) in case of positive match.

This actually can't return a negative number - only valid devid bits
are 0 to 9 inclusive, and this isn't going to ever change.  So the
patch isn't strictly necessary, but is good from the point of view
of ensuring consistency.  Hence:

> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>

Acked-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>

> ---
>  arch/arm/common/sa1111.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/common/sa1111.c b/arch/arm/common/sa1111.c
> index 3d22494..fb0a0a4 100644
> --- a/arch/arm/common/sa1111.c
> +++ b/arch/arm/common/sa1111.c
> @@ -1290,7 +1290,7 @@ static int sa1111_match(struct device *_dev, struct device_driver *_drv)
>  	struct sa1111_dev *dev = SA1111_DEV(_dev);
>  	struct sa1111_driver *drv = SA1111_DRV(_drv);
>  
> -	return dev->devid & drv->devid;
> +	return !!(dev->devid & drv->devid);
>  }
>  
>  static int sa1111_bus_suspend(struct device *dev, pm_message_t state)
> -- 
> 1.9.2
> 

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