linux-kernel - Re: [PATCH] backlight: pwm: handle EPROBE

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Message-ID: <20150312065914.GA3314@x1>
Date:	Thu, 12 Mar 2015 06:59:14 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-pwm@...r.kernel.org,
	thierry.reding@...il.com, jg1.han@...sung.com,
	linux-kernel@...r.kernel.org,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: Re: [PATCH] backlight: pwm: handle EPROBE_DEFER while requesting the
 PWM

On Thu, 19 Feb 2015, Nicolas Ferre wrote:

> When trying to request the PWM device with devm_pwm_get(), the EPROBE_DEFER
> flag is not handled properly. It can lead to the PWM not being found.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
> ---
>  drivers/video/backlight/pwm_bl.c | 4 ++++
>  1 file changed, 4 insertions(+)

I need a Thierry Ack for this.

> diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
> index 3a145a643e0d..6897f1c1bc73 100644
> --- a/drivers/video/backlight/pwm_bl.c
> +++ b/drivers/video/backlight/pwm_bl.c
> @@ -274,6 +274,10 @@ static int pwm_backlight_probe(struct platform_device *pdev)
>  
>  	pb->pwm = devm_pwm_get(&pdev->dev, NULL);
>  	if (IS_ERR(pb->pwm)) {
> +		ret = PTR_ERR(pb->pwm);
> +		if (ret == -EPROBE_DEFER)
> +			goto err_alloc;
> +
>  		dev_err(&pdev->dev, "unable to request PWM, trying legacy API\n");
>  		pb->legacy = true;
>  		pb->pwm = pwm_request(data->pwm_id, "pwm-backlight");

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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