linux-kernel - Re: [PATCH] pwm-backlight: add regulator and GPIO support

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Date:	Wed, 4 Jul 2012 12:48:40 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	Thierry Reding <thierry.reding@...onic-design.de>,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fbdev@...r.kernel.org
Subject: Re: [PATCH] pwm-backlight: add regulator and GPIO support

Hi Alexandre,

On Fri, Jun 29, 2012 at 10:22:47PM +0900, Alexandre Courbot wrote:
> @@ -221,8 +263,6 @@ static int pwm_backlight_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> -	dev_dbg(&pdev->dev, "got pwm for backlight\n");
> -
>  	/*
>  	 * The DT case will set the pwm_period_ns field to 0 and store the
>  	 * period, parsed from the DT, in the PWM device. For the non-DT case,
> @@ -231,6 +271,22 @@ static int pwm_backlight_probe(struct platform_device *pdev)
>  	if (data->pwm_period_ns > 0)
>  		pwm_set_period(pb->pwm, data->pwm_period_ns);
>  
> +
> +	pb->power_reg = devm_regulator_get(&pdev->dev, "power");
> +	if (IS_ERR(pb->power_reg))
> +		return PTR_ERR(pb->power_reg);

This looses several resources allocated earlier, like the enable gpio
and the pwm. This is really bad here since I have no regulator specified
and devm_regulator_get returns with -EPROBE_DEFER. Next time the core
tries to probe the driver the driver bails out because the gpio and the
pwm is already requested.

Sascha


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