linux-kernel - Re: [RFC][PATCH -mm 3/3] PM: Disable _request

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Date:	Mon, 28 May 2007 15:07:09 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oliver@...kum.org>
Subject: Re: [RFC][PATCH -mm 3/3] PM: Disable _request_firmware before hibernation/suspend

Hi!

> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> Use a hibernation and suspend notifier to disable the firmware requesting
> mechanism before a hibernation/suspend and enable it after the operation.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> 
>  drivers/base/firmware_class.c |   36 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
> 
> Index: linux-2.6.22-rc3/drivers/base/firmware_class.c
> ===================================================================
> --- linux-2.6.22-rc3.orig/drivers/base/firmware_class.c	2007-05-27 19:43:03.000000000 +0200
> +++ linux-2.6.22-rc3/drivers/base/firmware_class.c	2007-05-27 19:44:06.000000000 +0200
> @@ -17,6 +17,8 @@
>  #include <linux/bitops.h>
>  #include <linux/mutex.h>
>  #include <linux/kthread.h>
> +#include <linux/notifier.h>
> +#include <linux/suspend.h>
>  
>  #include <linux/firmware.h>
>  #include "base.h"
> @@ -35,6 +37,9 @@ enum {
>  
>  static int loading_timeout = 60;	/* In seconds */
>  
> +/* If set, _request_firmware() will exit immediately returning -EBUSY */
> +static int requesting_firmware_disabled;
> +
>  /* fw_lock could be moved to 'struct firmware_priv' but since it is just
>   * guarding for corner cases a global lock should be OK */
>  static DEFINE_MUTEX(fw_lock);
> @@ -397,6 +402,9 @@ _request_firmware(const struct firmware 
>  	struct firmware *firmware;
>  	int retval;
>  
> +	if (requesting_firmware_disabled)
> +		return -EBUSY;

WARN_ON()? This should not happen, and if it does, we'll end up with
non-working device.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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