On Wed 2007-11-14 22:25:57, Rafael J. Wysocki wrote:
> [Andrew, please consider this as 2.6.24 material, thanks.]
> ---
> From: Johannes Berg <[email protected]>
>
> Lockdep reports a circular locking dependency in the hibernate code
> because
> - during system boot hibernate code (from an initcall) locks pm_mutex
> and then a sysfs buffer mutex via name_to_dev_t
> - during regular operation hibernate code locks pm_mutex under a
> sysfs buffer mutex because it's called from sysfs methods.
>
> The deadlock can never happen because during initcall invocation nothing
> can write to sysfs yet. This removes the lockdep report by marking the
> initcall locking as being in a different class.
>
> Signed-off-by: Johannes Berg <[email protected]>
> Cc: Alan Stern <[email protected]>
> Cc: Peter Zijlstra <[email protected]>
> Cc: Pavel Machek <[email protected]>
ACK...
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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