linux-kernel - Re: [PATCH 1/1 linux-next] ACPI / SBS: fix sparse warning

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Message-ID: <20140929054004.GA4144@sudip-PC>
Date:	Mon, 29 Sep 2014 11:10:04 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Fabian Frederick <fabf@...net.be>
Cc:	linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 1/1 linux-next] ACPI / SBS: fix sparse warning

On Sun, Sep 28, 2014 at 08:44:47PM +0200, Fabian Frederick wrote:
> Adding parentheses around expression to avoid:
> drivers/acpi/sbs.c:444:28: warning: dubious: !x & y
> 
> Signed-off-by: Fabian Frederick <fabf@...net.be>
> ---
>  drivers/acpi/sbs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/sbs.c b/drivers/acpi/sbs.c
> index 32aecea..a7a3edd 100644
> --- a/drivers/acpi/sbs.c
> +++ b/drivers/acpi/sbs.c
> @@ -441,7 +441,7 @@ static int acpi_ac_get_present(struct acpi_sbs *sbs)
>  	 * The spec requires that bit 4 always be 1. If it's not set, assume
>  	 * that the implementation doesn't support an SBS charger
>  	 */
> -	if (!(status >> 4) & 0x1)
> +	if (!((status >> 4) & 0x1))

i think the logic changed over here.
it was !x & y , but now it has become !(x & y)
! is having higher priority than & so !x & y will mean ((!x) & y)

thanks
sudip
>  		return -ENODEV;
>  
>  	sbs->charger_present = (status >> 15) & 0x1;
> -- 
> 1.9.1
> 
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