linux-kernel - RE: [PATCH 2/2] regulator: tps65217: Fix voltage boundary checking in tps65217_pmic_map

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Date:	Tue, 3 Jul 2012 04:46:16 +0000
From:	"AnilKumar, Chimata" <anilkumar@...com>
To:	Axel Lin <axel.lin@...il.com>, "Girdwood, Liam" <lrg@...com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Nori, Sekhar" <nsekhar@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: RE: [PATCH 2/2] regulator: tps65217: Fix voltage boundary checking
 in tps65217_pmic_map_voltage

Hi Axel,

On Tue, Jul 03, 2012 at 08:35:55, Axel Lin wrote:
> It is ok to request voltage with min_uV < tps->info[rid]->min_uV and
> max_uV > tps->info[rid]->max_uV
> 
> Signed-off-by: Axel Lin <axel.lin@...il.com>
> ---
>  drivers/regulator/tps65217-regulator.c |    5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/regulator/tps65217-regulator.c b/drivers/regulator/tps65217-regulator.c
> index 0a3df5b..0947a09 100644
> --- a/drivers/regulator/tps65217-regulator.c
> +++ b/drivers/regulator/tps65217-regulator.c
> @@ -206,10 +206,7 @@ static int tps65217_pmic_map_voltage(struct regulator_dev *dev,
>  	if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
>  		return -EINVAL;
>  
> -	if (min_uV < tps->info[rid]->min_uV || min_uV > tps->info[rid]->max_uV)
> -		return -EINVAL;
> -
> -	if (max_uV < tps->info[rid]->min_uV || max_uV > tps->info[rid]->max_uV)
> +	if (max_uV < tps->info[rid]->min_uV || min_uV > tps->info[rid]->max_uV)
>  		return -EINVAL;

Case 1:-
------

tps->info[rid]->min_uV = 600000;
tps->info[rid]->max_uV = 1100000;

If we do regulator_set_voltage(reg, 550000, 1100000);

This results into error condition and how can we handle with this?

Case 2:-
------

I think the current code handles this case as well.

There might be a case where board/DT data is false like

tps->info[rid]->min_uV = 1100000;
tps->info[rid]->max_uV = 600000;

regulator_set_voltage(reg, 650000, 1100000);

Regards
AnilKumar--
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