From: Lin Ming <ming.m.lin@intel.com>
Date: Thu, 13 Sep 2012 22:26:33 +0000 (+0200)
Subject: ACPI / PM: Fix resource_lock dead lock in acpi_power_on_device
X-Git-Tag: v3.6-rc6~4^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=40bf66ec9791f1452b90b82aadc3b6e6aee201f5;p=pandora-kernel.git

ACPI / PM: Fix resource_lock dead lock in acpi_power_on_device

Commit 0090def("ACPI: Add interface to register/unregister device
to/from power resources") used resource_lock to protect the devices list
that relies on power resource. It caused a mutex dead lock, as below

    acpi_power_on ---> lock resource_lock
      __acpi_power_on
        acpi_power_on_device
          acpi_power_get_inferred_state
            acpi_power_get_list_state ---> lock resource_lock

This patch adds a new mutex "devices_lock" to protect the devices list
and calls acpi_power_on_device in acpi_power_on, instead of
__acpi_power_on, after the resource_lock is released.

[rjw: Changed data type of a boolean variable to bool.]

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---

Reading git-diff-tree failed