linux-kernel - Re: [PATCH 2/2] pm_trace: Add sysfs attr for rechecking dev hash.

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Date:	Sun, 10 Oct 2010 20:04:00 +0200
From:	Pavel Machek <pavel@....cz>
To:	James Hogan <james@...anarts.com>
Cc:	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, Len Brown <len.brown@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Randy Dunlap <rdunlap@...otime.net>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Alan Stern <stern@...land.harvard.edu>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	markgross <markgross@...gnar.org>
Subject: Re: [PATCH 2/2] pm_trace: Add sysfs attr for rechecking dev hash.

Hi!

> If the device which fails to resume is part of a loadable kernel module
> it won't be checked at startup against the magic number stored in the
> RTC.
> 
> Add a read-only sysfs attribute /sys/power/pm_trace_dev_hash which
> contains a list of newline separated devices (usually just the one)
> which currently match the last magic number. This allows the device
> which is failing to resume to be found after the modules are loaded
> again.

> --- a/Documentation/power/s2ram.txt
> +++ b/Documentation/power/s2ram.txt
> @@ -49,6 +49,13 @@ machine that doesn't boot) is:
>     device (lspci and /sys/devices/pci* is your friend), and see if you can
>     fix it, disable it, or trace into its resume function.
>  
> +   If no device matches the hash, it may be a device from a loadable kernel
> +   module that is not loaded until after the hash is checked. You can check
> +   the hash against the current devices again after more modules are loaded
> +   using sysfs:
> +
> +	cat /sys/power/pm_trace_dev_hash
> +

Yep, but exact semantics of that sysfs file should probably be linked
in the sysfs documentation...
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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