linux-kernel - Re: [Bug 10030] Suspend doesn't work when SD card is inserted

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Message-ID: <20080224182120.GB3886@ucw.cz>
Date:	Sun, 24 Feb 2008 19:21:21 +0100
From:	Pavel Machek <pavel@....cz>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Pierre Ossman <drzeus-mmc@...eus.cx>,
	Zdenek Kabelac <zdenek.kabelac@...il.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [Bug 10030] Suspend doesn't work when SD card is inserted

Hi!

> Index: usb-2.6/drivers/base/power/main.c
> ===================================================================
> --- usb-2.6.orig/drivers/base/power/main.c
> +++ usb-2.6/drivers/base/power/main.c
> @@ -25,6 +25,7 @@
>  #include <linux/pm.h>
>  #include <linux/resume-trace.h>
>  #include <linux/rwsem.h>
> +#include <linux/sched.h>
>  
>  #include "../base.h"
>  #include "power.h"
> @@ -59,6 +60,13 @@ static DECLARE_RWSEM(pm_sleep_rwsem);
>  
>  int (*platform_enable_wakeup)(struct device *dev, int is_on);
>  
> +static struct task_struct *suspending_task;

What locking protects this variable? What happens when suspending_task
exits? (Hmm, that would probably be bug, anyway?)

Or are we running UP when this is accessed? This at least needs a big
fat comment.

> +bool in_suspend_context(void)
> +{
> +	return (suspending_task == current);
> +}


							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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