ACPI / scan: Use acpi_bus_get_status() to initialize ACPI_TYPE_DEVICE devs

The acpi_get_bus_status wrapper for acpi_bus_get_status_handle has some
code to handle certain device quirks, in some cases we also need this
quirk handling for the initial _STA call.

Specifically on some devices calling _STA before all _DEP dependencies
are met results in errors like these:

[    0.123579] ACPI Error: No handler for Region [ECRM] (00000000ba9edc4c)
               [GenericSerialBus] (20170831/evregion-166)
[    0.123601] ACPI Error: Region GenericSerialBus (ID=9) has no handler
               (20170831/exfldio-299)
[    0.123618] ACPI Error: Method parse/execution failed
               \_SB.I2C1.BAT1._STA, AE_NOT_EXIST (20170831/psparse-550)

acpi_get_bus_status already has code to avoid this, so by using it we
also silence these errors from the initial _STA call.

Note that in order for the acpi_get_bus_status handling for this to work,
we initialize dep_unmet to 1 until acpi_device_dep_initialize gets called,
this means that battery devices will be instantiated with an initial
status of 0. This is not a problem, acpi_bus_attach will get called soon
after the instantiation anyways and it will update the status as first
point of order.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index b0fe5272c76aadfa59493bc954c6a545bbbc2008..8e63d937babb0de9d85cac007a03a6eda1258307 100644 (file)
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1565,6 +1565,8 @@ void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
        device_initialize(&device->dev);
        dev_set_uevent_suppress(&device->dev, true);
        acpi_init_coherency(device);
+       /* Assume there are unmet deps until acpi_device_dep_initialize() runs */
+       device->dep_unmet = 1;
 }
 
 void acpi_device_add_finalize(struct acpi_device *device)
@@ -1588,6 +1590,14 @@ static int acpi_add_single_object(struct acpi_device **child,
        }
 
        acpi_init_device_object(device, handle, type, sta);
+       /*
+        * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so
+        * that we can call acpi_bus_get_status() and use its quirk handling.
+        * Note this must be done before the get power-/wakeup_dev-flags calls.
+        */
+       if (type == ACPI_BUS_TYPE_DEVICE)
+               acpi_bus_get_status(device);
+
        acpi_bus_get_power_flags(device);
        acpi_bus_get_wakeup_device_flags(device);
 
@@ -1660,9 +1670,11 @@ static int acpi_bus_type_and_status(acpi_handle handle, int *type,
                        return -ENODEV;
 
                *type = ACPI_BUS_TYPE_DEVICE;
-               status = acpi_bus_get_status_handle(handle, sta);
-               if (ACPI_FAILURE(status))
-                       *sta = 0;
+               /*
+                * acpi_add_single_object updates this once we've an acpi_device
+                * so that acpi_bus_get_status' quirk handling can be used.
+                */
+               *sta = 0;
                break;
        case ACPI_TYPE_PROCESSOR:
                *type = ACPI_BUS_TYPE_PROCESSOR;
@@ -1760,6 +1772,8 @@ static void acpi_device_dep_initialize(struct acpi_device *adev)
        acpi_status status;
        int i;
 
+       adev->dep_unmet = 0;
+
        if (!acpi_has_method(adev->handle, "_DEP"))
                return;