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

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Date:	Mon, 15 Jun 2009 23:20:35 -0700
From:	Greg KH <gregkh@...e.de>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 012/143] USB: move twl4030_usb's probe function to
	.devinit.text

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 :)

So we would have to somehow know when that happens.

thanks,

greg k-h
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