Re: [PATCH] ACPI / PM: Hold acpi_scan_lock over system PMtransitions

[Toshi Kani]

On Tue, 2013-08-20 at 01:47 +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> 
> Bad things happen if ACPI hotplug events are handled during system
> PM transitions, especially if devices are removed as a result.
> To prevent those bad things from happening, acquire acpi_scan_lock
> when a transition is started and release it when that transition
> is complete or has been aborted.
> 
> This fixes resume lockup on my test-bed Acer Aspire S5 that happens
> when Thunderbolt devices are disconnected from the machine while
> suspended.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>

The change looks good to me.

Acked-by: Toshi Kani <toshi.kani@xxxxxx>

Thanks,
-Toshi


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