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

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Message-Id: <201303191759.27762.arnd@arndb.de>
Date:	Tue, 19 Mar 2013 17:59:27 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Fabio Porcedda <fabio.porcedda@...il.com>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	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 Tuesday 19 March 2013, Fabio Porcedda wrote:
> On Tue, Mar 19, 2013 at 5:48 PM, Arnd Bergmann <arnd@...db.de> wrote:
> > On Tuesday 19 March 2013, Geert Uytterhoeven wrote:
> >> Hmm, so we may have drivers that (now) work perfectly fine with
> >> module_platform_driver_probe()/platform_driver_probe(), but will start
> >> failing suddenly in the future?
> >
> > They will fail if someone changes the initialization order. That would
> > already break drivers before deferred probing support (and was the reason
> > we added feature in the first place), but now we can be much more liberal
> > with the order in which drivers are initialized, except when they are
> > using platform_driver_probe()
> >
> >> I guess we need a big fat WARN_ON(-EPROBE_DEFER) in
> >> platform_driver_probe() to catch these?
> >
> > Yes, very good idea.
> 
> If it's fine, I'll send a patch for that.

That would be cool, yes. I looked at it earlier (after sending my email above)
and couldn't find an easy way to do it though, because platform_drv_probe
does not know whether it is called from platform_driver_probe or not.

Maybe using something other than platform_driver_register would work here.

	Arnd
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