linux-kernel - Re: [RFT v3 05/14] regulator: max77802: Don't ignore return value of current opmode

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Message-ID: <54522412.1070808@collabora.co.uk>
Date:	Thu, 30 Oct 2014 12:42:10 +0100
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
	Ben Dooks <ben-linux@...ff.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org
CC:	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>
Subject: Re: [RFT v3 05/14] regulator: max77802: Don't ignore return value
 of current opmode

Hello Krzysztof,

On 10/30/2014 12:20 PM, Krzysztof Kozlowski wrote:
> The return value of regmap_read() of current opmode for regulator was
> silently ignored and whatever happened to be in 'val' variable was used
> as new opmode. This could lead to using bogus opmode.
> 
> Don't ignore what regmap_read() returns. If it fails just fall back to
> normal opmode.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> ---
>  drivers/regulator/max77802.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/regulator/max77802.c b/drivers/regulator/max77802.c
> index b9958d927297..60daca2028e9 100644
> --- a/drivers/regulator/max77802.c
> +++ b/drivers/regulator/max77802.c
> @@ -606,7 +606,13 @@ static int max77802_pmic_probe(struct platform_device *pdev)
>  		config.of_node = pdata->regulators[i].of_node;
>  
>  		ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
> -		val = val >> shift & MAX77802_OPMODE_MASK;
> +		if (ret < 0) {
> +			dev_warn(&pdev->dev,
> +				"cannot read current mode for %d\n", i);
> +			val = MAX77802_OPMODE_NORMAL;
> +		} else {
> +			val = val >> shift & MAX77802_OPMODE_MASK;
> +		}
>  
>  		/*
>  		 * If the regulator is disabled and the system warm rebooted,
> 

Reviewed-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>

Best regards,
Javier
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