linux-kernel - Re: [PATCH 10/10] drivers: misc: use module_platform_driver

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Date:	Mon, 18 Mar 2013 11:28:45 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Fabio Porcedda <fabio.porcedda@...il.com>
Cc:	H Hartley Sweeten <hartleys@...ionengravers.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	"Hans-Christian Egtvedt" <hans-christian.egtvedt@...el.com>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH 10/10] drivers: misc: use module_platform_driver_probe()

On Monday 18 March 2013, Fabio Porcedda wrote:
> 
> On Mon, Mar 18, 2013 at 11:58 AM, Arnd Bergmann <arnd@...db.de> wrote:
> > On Monday 18 March 2013, Fabio Porcedda wrote:
> >> Since by using platform_driver_probe() the  function
> >> ep93xx_pwm_probe() is freed after initialization,
> >> is better to use module_platform_drive_probe().
> >> IMHO i don't see any good reason to use module_platform_driver() for
> >> this driver.
> >
> > As I commented earlier, the platform_driver_probe() and
> > module_platform_drive_probe() interfaces are rather dangerous in combination
> > with deferred probing, I would much prefer Harley's patch.
> 
> Since those drivers don't use -EPROBE_DEFER i was thinking that they don't use
> deferred probing.
> I'm missing something?

clk_get() may return -EPROBE_DEFER after ep93xx is converted to use the
common clk API. We currently return the value of clk_get from the probe()
function, which will automatically do the right thing as long as the probe
function remains reachable.

	Arnd
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