[PATCH] ACPI: TAD: Check AC wake capability before enabling wakeup

[raoxu]

From: Xu Rao <raoxu@xxxxxxxxxxxxx>

ACPI_TAD_AC_WAKE is a non-zero bit definition, so testing the macro
itself is always true. As a result, every TAD device is initialized as
a system wakeup device, including RTC-only devices and devices whose
wake capability bits were cleared because _PRW is absent.

Test the capability value returned by _GCP instead. This keeps
RTC-only TAD devices usable without advertising a wakeup capability
that the firmware does not provide.

Fixes: 6c711fde3a1c ("ACPI: TAD: Support RTC without wakeup")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Xu Rao <raoxu@xxxxxxxxxxxxx>
---
 drivers/acpi/acpi_tad.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/acpi_tad.c b/drivers/acpi/acpi_tad.c
index 386fc1abcbdc..fc43df083738 100644
--- a/drivers/acpi/acpi_tad.c
+++ b/drivers/acpi/acpi_tad.c
@@ -856,7 +856,7 @@ static int acpi_tad_probe(struct platform_device *pdev)
 	 * runtime suspend.  Everything else should be taken care of by the ACPI
 	 * PM domain callbacks.
 	 */
-	if (ACPI_TAD_AC_WAKE) {
+	if (caps & ACPI_TAD_AC_WAKE) {
 		device_init_wakeup(dev, true);
 		dev_pm_set_driver_flags(dev, DPM_FLAG_SMART_SUSPEND |
 					     DPM_FLAG_MAY_SKIP_RESUME);
--
2.50.1