ACPI / property: Drop size_prop from acpi_dev_get_property_reference()
The size_prop argument of the recently added function
acpi_dev_get_property_reference() is not used by the only current
caller of that function and is very unlikely to be used at any time
going forward.
Namely, for a property whose value is a list of items each containing
a references to a device object possibly accompanied by some integers,
the number of items in the list can always be computed as the number
of elements of type ACPI_TYPE_LOCAL_REFERENCE in the property package.
Thus it should never be necessary to provide an additional "cells"
property with a value equal to the number of items in that list. It
also should never be necessary to provide a "cells" property specifying
how many integers are supposed to be following each reference.
For this reason, drop the size_prop argument from
acpi_dev_get_property_reference() and update its caller accordingly.
Link: http://marc.info/?l=linux-kernel&m=141511255610556&w=2
Suggested-by: Grant Likely <grant.likely@linaro.org>
Acked-by: Grant Likely <grant.likely@linaro.org>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index 27add91..0d08373 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -273,25 +273,21 @@
* acpi_dev_get_property_reference - returns handle to the referenced object
* @adev: ACPI device to get property
* @name: Name of the property
- * @size_prop: Name of the "size" property in referenced object
* @index: Index of the reference to return
* @args: Location to store the returned reference with optional arguments
*
* Find property with @name, verifify that it is a package containing at least
* one object reference and if so, store the ACPI device object pointer to the
- * target object in @args->adev.
+ * target object in @args->adev. If the reference includes arguments, store
+ * them in the @args->args[] array.
*
- * If the reference includes arguments (@size_prop is not %NULL) follow the
- * reference and check whether or not there is an integer property @size_prop
- * under the target object and if so, whether or not its value matches the
- * number of arguments that follow the reference. If there's more than one
- * reference in the property value package, @index is used to select the one to
- * return.
+ * If there's more than one reference in the property value package, @index is
+ * used to select the one to return.
*
* Return: %0 on success, negative error code on failure.
*/
-int acpi_dev_get_property_reference(struct acpi_device *adev, const char *name,
- const char *size_prop, size_t index,
+int acpi_dev_get_property_reference(struct acpi_device *adev,
+ const char *name, size_t index,
struct acpi_reference_args *args)
{
const union acpi_object *element, *end;
@@ -308,7 +304,7 @@
* return that reference then.
*/
if (obj->type == ACPI_TYPE_LOCAL_REFERENCE) {
- if (size_prop || index)
+ if (index)
return -EINVAL;
ret = acpi_bus_get_device(obj->reference.handle, &device);
@@ -348,42 +344,16 @@
element++;
nargs = 0;
- if (size_prop) {
- const union acpi_object *prop;
+ /* assume following integer elements are all args */
+ for (i = 0; element + i < end; i++) {
+ int type = element[i].type;
- /*
- * Find out how many arguments the refenced object
- * expects by reading its size_prop property.
- */
- ret = acpi_dev_get_property(device, size_prop,
- ACPI_TYPE_INTEGER, &prop);
- if (ret)
- return ret;
-
- nargs = prop->integer.value;
- if (nargs > MAX_ACPI_REFERENCE_ARGS
- || element + nargs > end)
+ if (type == ACPI_TYPE_INTEGER)
+ nargs++;
+ else if (type == ACPI_TYPE_LOCAL_REFERENCE)
+ break;
+ else
return -EPROTO;
-
- /*
- * Skip to the start of the arguments and verify
- * that they all are in fact integers.
- */
- for (i = 0; i < nargs; i++)
- if (element[i].type != ACPI_TYPE_INTEGER)
- return -EPROTO;
- } else {
- /* assume following integer elements are all args */
- for (i = 0; element + i < end; i++) {
- int type = element[i].type;
-
- if (type == ACPI_TYPE_INTEGER)
- nargs++;
- else if (type == ACPI_TYPE_LOCAL_REFERENCE)
- break;
- else
- return -EPROTO;
- }
}
if (idx++ == index) {