linux-kernel - Re: [PATCH 012/143] USB: move twl4030_usb's probe function to .devinit.text

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Date:	Tue, 16 Jun 2009 11:14:44 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 012/143] USB: move twl4030_usb's probe function to
	.devinit.text

Hi Greg,

On Mon, Jun 15, 2009 at 11:20:35PM -0700, Greg KH wrote:
> On Tue, Jun 16, 2009 at 08:05:59AM +0200, Uwe Kleine-König wrote:
> > Hi Greg,
> > 
> > On Mon, Jun 15, 2009 at 10:22:07PM -0700, Greg Kroah-Hartman wrote:
> > > A pointer to twl4030_usb_probe is passed to the core via
> > > platform_driver_register and so the function must not disappear when the
> > > .init sections are discarded.  Otherwise (if also having HOTPLUG=y)
> > > unbinding and binding a device to the driver via sysfs will result in an
> > > oops as does a device being registered late.
> > > 
> > > An alternative to this patch is using platform_driver_probe instead of
> > > platform_driver_register plus removing the pointer to the probe function
> > > from the struct platform_driver.
> > I wonder if this kind of error could be detected automatically.  That is
> > at probe time check if the probe function is in the .init.text section.
> 
> There's nothing wrong with calling probe functions in the .init.text
> section, _before_ we throw away the init.text section :)
Ah, my fault:

I wonder if this kind of error could be detected automatically.  That is
at *register* time check if the probe function is in the .init.text
section.

Best regards
Uwe

-- 
Pengutronix e.K.                              | Uwe Kleine-König            |
Industrial Linux Solutions                    | http://www.pengutronix.de/  |
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