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ACPI: Always check if _PRW is present before trying to evaluate it

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Before evaluating _PRW for devices that are reported as inactive or
not present by their _STA control methods we should check if those
methods are actually present (otherwise the evaulation of _PRW will
obviously fail and a scary message will be printed unnecessarily).

Reported-by: Andreas Mohr <andi@lisas.de>
Reported-by: Maciej Rutecki <maciej.rutecki@gmail.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Rafael J. Wysocki 2011-01-06 23:40:00 +01:00 committed by Len Brown
parent d0515d9fec
commit 86e4e20e8a
1 changed files with 7 additions and 2 deletions
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9
drivers/acpi/scan.c
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@ -1388,7 +1388,6 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
struct acpi_bus_ops *ops = context;
int type;
unsigned long long sta;
struct acpi_device_wakeup wakeup;
struct acpi_device *device;
acpi_status status;
int result;
@ -1399,7 +1398,13 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
!(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
acpi_bus_extract_wakeup_device_power_package(handle, &wakeup);
struct acpi_device_wakeup wakeup;
acpi_handle temp;
status = acpi_get_handle(handle, "_PRW", &temp);
if (ACPI_SUCCESS(status))
acpi_bus_extract_wakeup_device_power_package(handle,
&wakeup);
return AE_CTRL_DEPTH;
}