linux-kernel - Re: Re: [PATCH v3 1/4] leds: leds-pwm: Convert to use devm_get

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Message-ID: <20121211083632.GC27084@avionic-0098.adnet.avionic-design.de>
Date:	Tue, 11 Dec 2012 09:36:35 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Peter Ujfalusi <peter.ujfalusi@...com>
Cc:	Bryan Wu <cooloney@...il.com>, Richard Purdie <rpurdie@...ys.net>,
	Grant Likely <grant.likely@...retlab.ca>,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-doc@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: Re: [PATCH v3 1/4] leds: leds-pwm: Convert to use devm_get_pwm

On Tue, Dec 11, 2012 at 09:29:21AM +0100, Peter Ujfalusi wrote:
> On Tuesday 11 December 2012 08:03:07 Thierry Reding wrote:
> > On Mon, Dec 10, 2012 at 11:00:34AM +0100, Peter Ujfalusi wrote:
> > > Update the driver to use the new API for requesting pwm so we can take
> > > advantage of the pwm_lookup table to find the correct pwm to be used for
> > > the LED functionality.
> > > If the devm_get_pwm fails we fall back to legacy mode to try to get the
> > > pwm.
> > > 
> > > Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
> > > ---
> > > 
> > >  drivers/leds/leds-pwm.c  | 19 ++++++-------------
> > >  include/linux/leds_pwm.h |  2 +-
> > >  2 files changed, 7 insertions(+), 14 deletions(-)
> > > 
> > > diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c
> > > index 2157524..351257c 100644
> > > --- a/drivers/leds/leds-pwm.c
> > > +++ b/drivers/leds/leds-pwm.c
> > > @@ -67,12 +67,11 @@ static int led_pwm_probe(struct platform_device *pdev)
> > > 
> > >  		cur_led = &pdata->leds[i];
> > >  		led_dat = &leds_data[i];
> > > 
> > > -		led_dat->pwm = pwm_request(cur_led->pwm_id,
> > > -				cur_led->name);
> > > +		led_dat->pwm = devm_pwm_get(&pdev->dev, cur_led->name);
> > > 
> > >  		if (IS_ERR(led_dat->pwm)) {
> > >  		
> > >  			ret = PTR_ERR(led_dat->pwm);
> > > 
> > > -			dev_err(&pdev->dev, "unable to request PWM %d\n",
> > > -					cur_led->pwm_id);
> > > +			dev_err(&pdev->dev, "unable to request PWM for %s\n",
> > > +				cur_led->name);
> > > 
> > >  			goto err;
> > >  		
> > >  		}
> > 
> > The commit message says that legacy mode is used as fallback if
> > devm_get_pwm() (that should really be devm_pwm_get() btw) fails but I
> > don't see where pwm_request() is called.
> 
> Oh, true. The fallback has been removed based on earlier comment from Bryan 
> Wu. I will correct the commit message.

I'm not so sure that's a good idea. After all there may still be users
who rely on the legacy behaviour.

Thierry

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