linux-kernel - Re: [linux-pm] Re: [patch] suspend/resume debugging: device filter

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Message-ID: <20070508025426.GA28166@kroah.com>
Date:	Mon, 7 May 2007 19:54:26 -0700
From:	Greg KH <greg@...ah.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Ingo Molnar <mingo@...e.hu>, Andrew Morton <akpm@...l.org>,
	Linus Torvalds <torvalds@...l.org>, Greg KH <gregkh@...e.de>,
	linux-pm@...ts.osdl.org, linux-kernel@...r.kernel.org
Subject: Re: [linux-pm] Re: [patch] suspend/resume debugging: device filter

On Sat, May 05, 2007 at 12:08:55PM +0200, Pavel Machek wrote:
> Hi!
> 
> > > Here's a (compile tested only) patch that does this on a per-device 
> > > basis, which is smaller, and should work just as well as your patch.
> > > 
> > > It creates a new file in the power/ directory for every device called 
> > > "can_suspend".  Write a '0' to it to prevent that device from being 
> > > suspended.
> > > 
> > > Does this work for you?
> > 
> > yeah, i was able to use this too to debug suspend/resume problems. But 
> > i've added the check to the resume path too - for example sw-suspend 
> > does a resume of devices during its suspend cycle, cutting off much of 
> > the netconsole output.
> > 
> > which makes the can_suspend flag mis-named - perhaps rename it to 
> > exclude_pm ?
> 
> debug_exclude_pm? I do not want people playing with it, then
> complaining that they broke the suspend.

I can make the attribute only show up if CONFIG_DEBUG_DRIVER is enabled.
Would that be better?  We can also write to the syslog when the
attribute is changed that they just might have broken something.

thanks,

greg k-h
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