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Commit 42787ed7 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
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ACPI: PM: Fix regression in acpi_device_set_power()



Commit f850a48a ("ACPI: PM: Allow transitions to D0 to occur in
special cases") overlooked the fact that acpi_power_transition() may
change the power.state value for the target device and if that
happens, it may confuse acpi_device_set_power() and cause it to
omit the _PS0 evaluation which on some systems is necessary to
change power states of devices from low-power to D0.

Fix that by saving the current value of power.state for the
target device before passing it to acpi_power_transition() and
using the saved value in a subsequent check.

Fixes: f850a48a ("ACPI: PM: Allow transitions to D0 to occur in special cases")
Reported-by: default avatarKai-Heng Feng <kai.heng.feng@canonical.com>
Reported-by: default avatarMario Limonciello <mario.limonciello@dell.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: default avatarKai-Heng Feng <kai.heng.feng@canonical.com>
Tested-by: default avatarMario Limonciello <mario.limonciello@dell.com>
parent 609488bc
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