linux-kernel - Re: [PATCH] ACPI / PM: Hold acpi_scan

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Date:	Tue, 20 Aug 2013 16:02:03 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: [PATCH] ACPI / PM: Hold acpi_scan_lock over system PM
 transitions

On Tue, 2013-08-20 at 01:47 +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> 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@...el.com>

The change looks good to me.

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

Thanks,
-Toshi


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