[PATCH 2/4] ACPI / dock: Rework and simplify find_dock_devices()

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>

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@xxxxxxxxx>
---
 drivers/acpi/dock.c |   19 +++----------------
 1 file changed, 3 insertions(+), 16 deletions(-)

Index: linux-pm/drivers/acpi/dock.c
===================================================================
--- linux-pm.orig/drivers/acpi/dock.c
+++ linux-pm/drivers/acpi/dock.c
@@ -855,26 +855,13 @@ static struct notifier_block dock_acpi_n
 static acpi_status
 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;
 }
 

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