ACPI: PM: Avoid attaching ACPI PM domain to certain devices

Certain ACPI-enumerated devices represented as platform devices in
Linux, like fans, require special low-level power management handling
implemented by their drivers that is not in agreement with the ACPI
PM domain behavior.  That leads to problems with managing ACPI fans
during system-wide suspend and resume.

For this reason, make acpi_dev_pm_attach() skip the affected devices
by adding a list of device IDs to avoid to it and putting the IDs of
the affected devices into that list.

Fixes: e5cc8ef31267 (ACPI / PM: Provide ACPI PM callback routines for subsystems)
Reported-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: Todd Brandt <todd.e.brandt@linux.intel.com>
Cc: 3.10+ <stable@vger.kernel.org> # 3.10+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index 08bb9f2..5e4a886 100644 (file)
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -1314,9 +1314,19 @@ static void acpi_dev_pm_detach(struct device *dev, bool power_off)
  */
 int acpi_dev_pm_attach(struct device *dev, bool power_on)
 {
+       /*
+        * Skip devices whose ACPI companions match the device IDs below,
+        * because they require special power management handling incompatible
+        * with the generic ACPI PM domain.
+        */
+       static const struct acpi_device_id special_pm_ids[] = {
+               {"PNP0C0B", }, /* Generic ACPI fan */
+               {"INT3404", }, /* Fan */
+               {}
+       };
        struct acpi_device *adev = ACPI_COMPANION(dev);
 
-       if (!adev)
+       if (!adev || !acpi_match_device_ids(adev, special_pm_ids))
                return 0;
 
        /*