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Date: Sun, 03 Feb 2013 14:13:54 +0100 From: "Rafael J. Wysocki" <rjw@...k.pl> To: ACPI Devel Maling List <linux-acpi@...r.kernel.org> Cc: LKML <linux-kernel@...r.kernel.org> Subject: [PATCH] ACPI / PM: Handle missing _PSC in acpi_bus_update_power() From: Rafael J. Wysocki <rafael.j.wysocki@...el.com> If _PS0 is defined for an ACPI device node, but _PSC isn't and the device node doesn't use power resources for power management, acpi_bus_update_power() will fail to update the power state of it, because acpi_device_get_power() returns ACPI_STATE_UNKNOWN in that case. To handle that situation make acpi_bus_update_power() follow acpi_bus_init_power() and try to force the given device node into power state D0 if its actual power state cannot be determined. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> --- On top of linux-pm.git/bleeding-edge. Thanks, Rafael --- drivers/acpi/device_pm.c | 3 +++ 1 file changed, 3 insertions(+) Index: linux-pm/drivers/acpi/device_pm.c =================================================================== --- linux-pm.orig/drivers/acpi/device_pm.c +++ linux-pm/drivers/acpi/device_pm.c @@ -355,6 +355,9 @@ int acpi_bus_update_power(acpi_handle ha if (result) return result; + if (state == ACPI_STATE_UNKNOWN) + state = ACPI_STATE_D0; + result = acpi_device_set_power(device, state); if (!result && state_p) *state_p = state; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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