USB: ACPI: Replace usb_acpi_find_port() with acpi_find_child_by_adr()

Instead of walking the list of children of an ACPI device directly
in order to find the child matching a given bus address, use
acpi_find_child_by_adr() for this purpose.

Also notice that if acpi_find_child_by_adr() doesn't find a matching
child, acpi_find_child_device() will not find it too, so directly
replace usb_acpi_find_port() in usb_acpi_get_companion_for_port() with
acpi_find_child_by_adr() and drop it entirely.

Apart from simplifying the code, this will help to eliminate the
children list head from struct acpi_device as it is redundant and it
is used in questionable ways in some places (in particular, locking is
needed for walking the list pointed to it safely, but it is often
missing).

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

diff --git a/drivers/usb/core/usb-acpi.c b/drivers/usb/core/usb-acpi.c
index d4dcaefd0ea4012ddb9964fd21c8a837515d0fb5..6d93428432f13f1e2cc8461570eebae935c4429c 100644 (file)
--- a/drivers/usb/core/usb-acpi.c
+++ b/drivers/usb/core/usb-acpi.c
@@ -124,22 +124,6 @@ out:
  */
 #define USB_ACPI_LOCATION_VALID (1 << 31)
 
-static struct acpi_device *usb_acpi_find_port(struct acpi_device *parent,
-                                             int raw)
-{
-       struct acpi_device *adev;
-
-       if (!parent)
-               return NULL;
-
-       list_for_each_entry(adev, &parent->children, node) {
-               if (acpi_device_adr(adev) == raw)
-                       return adev;
-       }
-
-       return acpi_find_child_device(parent, raw, false);
-}
-
 static struct acpi_device *
 usb_acpi_get_companion_for_port(struct usb_port *port_dev)
 {
@@ -170,7 +154,7 @@ usb_acpi_get_companion_for_port(struct usb_port *port_dev)
                port1 = port_dev->portnum;
        }
 
-       return usb_acpi_find_port(adev, port1);
+       return acpi_find_child_by_adr(adev, port1);
 }
 
 static struct acpi_device *