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

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Date:	Mon, 18 Mar 2013 11:03:18 +0100
From:	Fabio Porcedda <fabio.porcedda@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
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 Fri, Mar 15, 2013 at 9:18 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Friday 15 March 2013, H Hartley Sweeten wrote:
>> Arnd,
>>
>> Ill look at converting the ep93xx pwm driver to the PWM subsystem. The only issue is
>> the current driver exposes a sysfs interface that I think is not available in that subsystem.
>
> You can probably keep providing that interface if you have active users.
>
>> >* Regarding the use of module_platform_driver_probe, I'm a little worried about
>> >  the interactions with deferred probing. I don't think there are any regressions,
>> >  but we should probably make people aware that one cannot return -EPROBE_DEFER
>> >  from a platform_driver_probe function.
>>
>> The ep93xx pwm driver does not need to use platform_driver_probe(). It can be changed
>> to use module_platform_driver() by just moving the .probe to the platform_driver. This
>> driver was added before module_platform_driver() was available and I used the
>> platform_driver_probe() thinking it would save a couple lines of code.

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.

Best regards
Fabio Porcedda

>> I'll change this in a bit. Right now I'm trying to work out why kernel 3.8 is not booting
>> on the ep93xx. I had 3.6.6 on my development board and 3.7 works fine but 3.8 hangs
>> without uncompressing the kernel.
>
> Ok, thanks!
>
>         Arnd
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