linux-kernel - Re: [PATCH] register at91_ether using platform_driver

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Message-Id: <200907221037.36541.david-b@pacbell.net>
Date:	Wed, 22 Jul 2009 10:37:36 -0700
From:	David Brownell <david-b@...bell.net>
To:	"Uwe Kleine-König" 
	<u.kleine-koenig@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	netdev@...r.kernel.org,
	Paulius Zaleckas <paulius.zaleckas@...tonika.lt>,
	Marc Pignat <marc.pignat@...s.ch>,
	Andrew Victor <linux@...im.org.za>,
	Roel Kluin <12o3l@...cali.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Greg Kroah-Hartman" <gregkh@...e.de>
Subject: Re: [PATCH] register at91_ether using platform_driver_probe

On Tuesday 21 July 2009, Uwe Kleine-König wrote:
> at91ether_probe lives in .init.text, so using platform_driver_register
> to register it is wrong because binding a device after the init memory
> is discarded (e.g. via sysfs) results in an oops.
> 
> As requested by David Brownell platform_driver_probe is used instead of
> moving the probe function to .devinit.text as proposed initially.
> This saves some memory, but devices registered after the driver is
> probed are not bound (probably there are none) and binding via sysfs
> isn't possible.

Right, these devices do not hotplug.

> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> Cc: David Brownell <dbrownell@...rs.sourceforge.net>

Acked-by: David Brownell <dbrownell@...rs.sourceforge.net>

.... and thanks for doing it this way.  :)

> Cc: netdev@...r.kernel.org
> Cc: Paulius Zaleckas <paulius.zaleckas@...tonika.lt>
> Cc: Marc Pignat <marc.pignat@...s.ch>
> Cc: Andrew Victor <linux@...im.org.za>
> Cc: Roel Kluin <12o3l@...cali.nl>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Greg Kroah-Hartman <gregkh@...e.de>
> 
> ---
>  drivers/net/arm/at91_ether.c |    3 +--
>  1 files changed, 1 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/arm/at91_ether.c b/drivers/net/arm/at91_ether.c
> index 2e7419a..5041d10 100644
> --- a/drivers/net/arm/at91_ether.c
> +++ b/drivers/net/arm/at91_ether.c
> @@ -1228,7 +1228,6 @@ static int at91ether_resume(struct platform_device *pdev)
>  #endif
>  
>  static struct platform_driver at91ether_driver = {
> -	.probe		= at91ether_probe,
>  	.remove		= __devexit_p(at91ether_remove),
>  	.suspend	= at91ether_suspend,
>  	.resume		= at91ether_resume,
> @@ -1240,7 +1239,7 @@ static struct platform_driver at91ether_driver = {
>  
>  static int __init at91ether_init(void)
>  {
> -	return platform_driver_register(&at91ether_driver);
> +	return platform_driver_probe(&at91ether_driver, at91ether_probe);
>  }
>  
>  static void __exit at91ether_exit(void)
> -- 
> tg: (4b0a840..) t/platsection/at91ether_driver (depends on: linus/master)
> 
> 



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