linux-kernel - Re: [PATCH 1/3] imx-drm: imx-tve: Check the return value of 'regulator

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Date:	Tue, 21 May 2013 10:39:47 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Fabio Estevam <fabio.estevam@...escale.com>
CC:	<gregkh@...uxfoundation.org>, <kernel@...gutronix.de>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] imx-drm: imx-tve: Check the return value of
 'regulator_enable()'

On Mon, May 20, 2013 at 10:55:49AM -0300, Fabio Estevam wrote:
> Check the return value of 'regulator_enable()' to fix the following build error:
> 
s/error/warning

It may be helpful to mention that the warning shows up since commit
c8801a8 (regulator: core: Mark all get and enable calls as
__must_check).

Other than these, 

Acked-by: Shawn Guo <shawn.guo@...aro.org>

> drivers/staging/imx-drm/imx-tve.c: In function 'imx_tve_probe':
> drivers/staging/imx-drm/imx-tve.c:671:19: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
> 
> Signed-off-by: Fabio Estevam <fabio.estevam@...escale.com>
> ---
>  drivers/staging/imx-drm/imx-tve.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/imx-drm/imx-tve.c b/drivers/staging/imx-drm/imx-tve.c
> index a6efa8f6..ce65ad3 100644
> --- a/drivers/staging/imx-drm/imx-tve.c
> +++ b/drivers/staging/imx-drm/imx-tve.c
> @@ -668,7 +668,9 @@ static int imx_tve_probe(struct platform_device *pdev)
>  	tve->dac_reg = devm_regulator_get(&pdev->dev, "dac");
>  	if (!IS_ERR(tve->dac_reg)) {
>  		regulator_set_voltage(tve->dac_reg, 2750000, 2750000);
> -		regulator_enable(tve->dac_reg);
> +		ret = regulator_enable(tve->dac_reg);
> +		if (ret)
> +			return ret;
>  	}
>  
>  	tve->clk = devm_clk_get(&pdev->dev, "tve");
> -- 
> 1.8.1.2
> 
> 

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