ACPI: use handle, not device, in system notification path

This patch changes the global system notification path so it uses the
acpi_handle, not the acpi_device.

System notifications often deal with device presence and status change.
In these cases, we may not have an acpi_device.  For example, we may
get a Device Check notification on an object that previously was not
present.  Since the object was not present, we would not have had an
acpi_device for it.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 2b08c3d..2876fc7 100644 (file)
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -450,11 +450,14 @@ int acpi_bus_receive_event(struct acpi_bus_event *event)
                              Notification Handling
    -------------------------------------------------------------------------- */
 
-static void acpi_bus_check_device(struct acpi_device *device)
+static void acpi_bus_check_device(acpi_handle handle)
 {
+       struct acpi_device *device;
        acpi_status status;
        struct acpi_device_status old_status;
 
+       if (acpi_bus_get_device(handle, &device))
+               return;
        if (!device)
                return;
 
@@ -488,13 +491,10 @@ static void acpi_bus_check_device(struct acpi_device *device)
        }
 }
 
-static void acpi_bus_check_scope(struct acpi_device *device)
+static void acpi_bus_check_scope(acpi_handle handle)
 {
-       if (!device)
-               return;
-
        /* Status Change? */
-       acpi_bus_check_device(device);
+       acpi_bus_check_device(handle);
 
        /*
         * TBD: Enumerate child devices within this device's scope and
@@ -531,13 +531,10 @@ static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
        blocking_notifier_call_chain(&acpi_bus_notify_list,
                type, (void *)handle);
 
-       if (acpi_bus_get_device(handle, &device))
-               return;
-
        switch (type) {
 
        case ACPI_NOTIFY_BUS_CHECK:
-               acpi_bus_check_scope(device);
+               acpi_bus_check_scope(handle);
                /*
                 * TBD: We'll need to outsource certain events to non-ACPI
                 *      drivers via the device manager (device.c).
@@ -545,7 +542,7 @@ static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
                break;
 
        case ACPI_NOTIFY_DEVICE_CHECK:
-               acpi_bus_check_device(device);
+               acpi_bus_check_device(handle);
                /*
                 * TBD: We'll need to outsource certain events to non-ACPI
                 *      drivers via the device manager (device.c).
@@ -583,10 +580,13 @@ static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
                break;
        }
 
-       driver = device->driver;
-       if (driver && driver->ops.notify &&
-           (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
-               driver->ops.notify(device, type);
+       acpi_bus_get_device(handle, &device);
+       if (device) {
+               driver = device->driver;
+               if (driver && driver->ops.notify &&
+                   (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
+                       driver->ops.notify(device, type);
+       }
 }
 
 /* --------------------------------------------------------------------------