linux-kernel - Re: [PATCH/RFC v5 01/57] leds: Add brightness_set

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Date:	Thu, 13 Aug 2015 16:23:49 +0200
From:	Pavel Machek <pavel@....cz>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	Jacek Anaszewski <j.anaszewski@...sung.com>,
	linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
	cooloney@...il.com, rpurdie@...ys.net, stsp@...rs.sourceforge.net,
	Sakari Ailus <sakari.ailus@...ux.intel.com>
Subject: Re: [PATCH/RFC v5 01/57] leds: Add brightness_set_nonblocking op

On Thu 2015-08-13 16:15:47, Andrew Lunn wrote:
> On Tue, Aug 11, 2015 at 11:37:14AM +0200, Jacek Anaszewski wrote:
> > This patch adds a new brightness_set_nonblocking op to the LED subsystem.
> > The op is intended for drivers that set brightness in a non-blocking way,
> > i.e. they neither sleep nor use delays while setting brightness.
> > 
> > Signed-off-by: Jacek Anaszewski <j.anaszewski@...sung.com>
> > Cc: Bryan Wu <cooloney@...il.com>
> > Cc: Andrew Lunn <andrew@...n.ch>
> > Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>
> > Cc: Pavel Machek <pavel@....cz>
> > Cc: Stas Sergeev <stsp@...rs.sourceforge.net>
> > ---
> >  include/linux/leds.h |    3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/include/linux/leds.h b/include/linux/leds.h
> > index b122eea..c32f1b8 100644
> > --- a/include/linux/leds.h
> > +++ b/include/linux/leds.h
> > @@ -53,6 +53,9 @@ struct led_classdev {
> >  	/* Must not sleep, use a workqueue if needed */
> >  	void		(*brightness_set)(struct led_classdev *led_cdev,
> >  					  enum led_brightness brightness);
> > +	/* Intended for drivers that set brightness in a non-blocking way */
> > +	void (*brightness_set_nonblocking)(struct led_classdev *led_cdev,
> > +					  enum led_brightness brightness);
> 
> Hi Jacek
> 
> >From an API design point of view, i'm not sure this is the best way to
> go. You now have two calls which do the same thing, with the plan that
> you want to invert the meaning of brightness_set, the old well known
> API call, sometime later. This inverting the meaning is going to catch
> people out and introduce bugs.

Yes please.
									Pavel

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