linux-kernel - Re: [PATCH] move omap_udc's probe function to .devinit.text

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Date:	Sun, 12 Jul 2009 02:37:51 -0700
From:	David Brownell <david-b@...bell.net>
To:	"Uwe Kleine-König" 
	<u.kleine-koenig@...gutronix.de>
Cc:	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	Philipp Zabel <philipp.zabel@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <rmk@....linux.org.uk>,
	Dmitry Baryshkov <dbaryshkov@...il.com>
Subject: Re: [PATCH] move omap_udc's probe function to .devinit.text

On Sunday 12 July 2009, Uwe Kleine-König wrote:
> 
> > Repeat -- NAK on this.  Use platform_driver_probe() instead.
> > 
> > I really don't like this series of patches.  It's just adding
> > bloat to kernels, in chunks of up to a page per patch.
>
> I'm aware that in some cases platform_driver_probe is better.

Make that "most cases".  It's rare that platform devices get
hotplugged.  Mostly they're set up at system init ... often
it's all done by the time arch_initcall() finishes.

> But as I 
> don't have access to most of the affected platforms I consider it saver.
> That's why I choosed this way.

You do have access to the source tree, and a powerful little
tool called "grep -r" ... which can easily tell you where the
devices for those platforms are defined.  And thus let you see
if a given one happens to be one of the exceptional cases where
platform_driver_probe() won't work.

> The problem with platform_driver_probe 
> is that if a device is added only after the driver is probed the
> device isn't bound.

That's rarely a problem though; it certainly isn't in the case of
the $SUBJECT driver, and others on that platform.  I've pointed
that out to you before.

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