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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-06-30 23:46:02 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-07-15 01:33:11 +0200
commit96c0a4d4902c3d5f56bde95d3e2d96689ca64b6d (patch)
treee9ef696424afa94c1c2ecc5917436c1f8d681738 /drivers/acpi/dock.c
parentd460acebd7959cc91e7edc594d90adb9b72a0b05 (diff)
ACPI / dock: Rework and simplify find_dock_devices()
Since acpi_walk_namespace() calls find_dock_devices() during tree pre-order visit, the latter doesn't need to add devices whose parents have _EJD pointing to the docking station to the list of that station's dependent devices, because those parents are going to be added to that list anyway and the removal of a parent will take care of the removal of its children in those cases. For this reason, rework find_dock_devices() to only call add_dock_dependent_device() for devices whose _EJD point directy to the docking station represented by its context argument and simplify it slightly. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Yinghai Lu <yinghai@kernel.org>
Diffstat (limited to 'drivers/acpi/dock.c')
-rw-r--r--drivers/acpi/dock.c23
1 files changed, 5 insertions, 18 deletions
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index c10761533d6f..7c86d01346e6 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -741,29 +741,16 @@ static struct notifier_block dock_acpi_notifier = {
* check to see if an object has an _EJD method. If it does, then it
* will see if it is dependent on the dock station.
*/
-static acpi_status __init
-find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv)
+static acpi_status __init find_dock_devices(acpi_handle handle, u32 lvl,
+ void *context, void **rv)
{
- acpi_status status;
- acpi_handle tmp, parent;
struct dock_station *ds = context;
+ acpi_handle ejd = NULL;
- status = acpi_bus_get_ejd(handle, &tmp);
- if (ACPI_FAILURE(status)) {
- /* try the parent device as well */
- status = acpi_get_parent(handle, &parent);
- if (ACPI_FAILURE(status))
- goto fdd_out;
- /* see if parent is dependent on dock */
- status = acpi_bus_get_ejd(parent, &tmp);
- if (ACPI_FAILURE(status))
- goto fdd_out;
- }
-
- if (tmp == ds->handle)
+ acpi_bus_get_ejd(handle, &ejd);
+ if (ejd == ds->handle)
add_dock_dependent_device(ds, handle);
-fdd_out:
return AE_OK;
}