netdev - Re: [PATCH 08/11] ssb: driver_chip_comon_pmu: Fix probable mask then right shift defect

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Date:	Mon, 27 Oct 2014 18:32:31 +0100
From:	Michael Büsch <m@...s.ch>
To:	Joe Perches <joe@...ches.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 08/11] ssb: driver_chip_comon_pmu: Fix probable mask
 then right shift defect

On Sun, 26 Oct 2014 22:25:04 -0700
Joe Perches <joe@...ches.com> wrote:

> Precedence of & and >> is not the same and is not left to right.
> shift has higher precedence and should be done after the mask.
> 
> Add parentheses around the mask.
> 
> Signed-off-by: Joe Perches <joe@...ches.com>

Good catch.

Reviewed-by: Michael Büsch <m@...s.ch>

> ---
>  drivers/ssb/driver_chipcommon_pmu.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/ssb/driver_chipcommon_pmu.c b/drivers/ssb/driver_chipcommon_pmu.c
> index 1173a09..bc71583 100644
> --- a/drivers/ssb/driver_chipcommon_pmu.c
> +++ b/drivers/ssb/driver_chipcommon_pmu.c
> @@ -621,8 +621,8 @@ static u32 ssb_pmu_get_alp_clock_clk0(struct ssb_chipcommon *cc)
>  	u32 crystalfreq;
>  	const struct pmu0_plltab_entry *e = NULL;
>  
> -	crystalfreq = chipco_read32(cc, SSB_CHIPCO_PMU_CTL) &
> -		      SSB_CHIPCO_PMU_CTL_XTALFREQ >> SSB_CHIPCO_PMU_CTL_XTALFREQ_SHIFT;
> +	crystalfreq = (chipco_read32(cc, SSB_CHIPCO_PMU_CTL) &
> +		       SSB_CHIPCO_PMU_CTL_XTALFREQ) >> SSB_CHIPCO_PMU_CTL_XTALFREQ_SHIFT;
>  	e = pmu0_plltab_find_entry(crystalfreq);
>  	BUG_ON(!e);
>  	return e->freq * 1000;




-- 
Michael

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