linux-kernel - Re: [PATCH 4/9] backlight: atmel-pwm-bl: clean up probe error handling

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Message-ID: <20131029130934.GB29615@localhost>
Date:	Tue, 29 Oct 2013 14:09:34 +0100
From:	Johan Hovold <jhovold@...il.com>
To:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
Cc:	Johan Hovold <jhovold@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Jingoo Han <jg1.han@...sung.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/9] backlight: atmel-pwm-bl: clean up probe error
 handling

On Fri, Oct 25, 2013 at 01:11:25PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> On 11:55 Wed 23 Oct     , Johan Hovold wrote:
> > Clean up probe error handling by checking parameters before any
> > allocations and removing an obsolete error label. Also remove
> > unnecessary reset of private gpio number.
> > 
> > Acked-by: Jingoo Han <jg1.han@...sung.com>
> > Signed-off-by: Johan Hovold <jhovold@...il.com>
> > ---
> >  drivers/video/backlight/atmel-pwm-bl.c | 31 ++++++++++++-------------------
> >  1 file changed, 12 insertions(+), 19 deletions(-)
> > 
> > diff --git a/drivers/video/backlight/atmel-pwm-bl.c b/drivers/video/backlight/atmel-pwm-bl.c
> > index cc5a5ed..52a8134 100644
> > --- a/drivers/video/backlight/atmel-pwm-bl.c
> > +++ b/drivers/video/backlight/atmel-pwm-bl.c
> > @@ -126,40 +126,33 @@ static int atmel_pwm_bl_probe(struct platform_device *pdev)
> >  	struct atmel_pwm_bl *pwmbl;
> >  	int retval;
> >  
> > +	pdata = dev_get_platdata(&pdev->dev);
> > +	if (!pdata)
> > +		return -ENODEV;
> > +
> > +	if (pdata->pwm_compare_max < pdata->pwm_duty_max ||
> > +			pdata->pwm_duty_min > pdata->pwm_duty_max ||
> > +			pdata->pwm_frequency == 0)
> > +		return -EINVAL;
> > +
> >  	pwmbl = devm_kzalloc(&pdev->dev, sizeof(struct atmel_pwm_bl),
> >  				GFP_KERNEL);
> >  	if (!pwmbl)
> >  		return -ENOMEM;
> >  
> >  	pwmbl->pdev = pdev;
> > -
> > -	pdata = dev_get_platdata(&pdev->dev);
> > -	if (!pdata) {
> > -		retval = -ENODEV;
> > -		goto err_free_mem;
> > -	}
> > -
> > -	if (pdata->pwm_compare_max < pdata->pwm_duty_max ||
> > -			pdata->pwm_duty_min > pdata->pwm_duty_max ||
> > -			pdata->pwm_frequency == 0) {
> > -		retval = -EINVAL;
> > -		goto err_free_mem;
> > -	}
> > -
> >  	pwmbl->pdata = pdata;
> >  	pwmbl->gpio_on = pdata->gpio_on;
> >  
> >  	retval = pwm_channel_alloc(pdata->pwm_channel, &pwmbl->pwmc);
> >  	if (retval)
> > -		goto err_free_mem;
> > +		return retval;
> >  
> >  	if (pwmbl->gpio_on != -1) {
> gpio_is_valid here

Again, this is unrelated to this patch and is fixed separately in patch
7/9.

Johan

> >  		retval = devm_gpio_request(&pdev->dev, pwmbl->gpio_on,
> >  					"gpio_atmel_pwm_bl");
> > -		if (retval) {
> > -			pwmbl->gpio_on = -1;
> > +		if (retval)
> >  			goto err_free_pwm;
> > -		}
> >  
> >  		/* Turn display off by default. */
> >  		retval = gpio_direction_output(pwmbl->gpio_on,
> > @@ -197,7 +190,7 @@ static int atmel_pwm_bl_probe(struct platform_device *pdev)
> >  
> >  err_free_pwm:
> >  	pwm_channel_free(&pwmbl->pwmc);
> > -err_free_mem:
> > +
> >  	return retval;
> >  }
> >  
> > -- 
> > 1.8.4
> > 
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