1 files changed, 162 insertions, 46 deletions

diff --git a/drivers/acpi/resources/rsxface.c b/drivers/acpi/resources/rsxface.c
index 09d250ab9872..50a956b705b0 100644
--- a/drivers/acpi/resources/rsxface.c
+++ b/drivers/acpi/resources/rsxface.c
@@ -64,6 +64,10 @@ ACPI_MODULE_NAME("rsxface")
 	ACPI_COPY_FIELD(out, in, translation_offset);        \
 	ACPI_COPY_FIELD(out, in, address_length);            \
 	ACPI_COPY_FIELD(out, in, resource_source);
+/* Local prototypes */
+static acpi_status
+acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context);
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_get_irq_routing_table
@@ -86,6 +90,7 @@ ACPI_MODULE_NAME("rsxface")
  *              the object indicated by the passed device_handle.
  *
  ******************************************************************************/
+
 acpi_status
 acpi_get_irq_routing_table(acpi_handle device_handle,
 			   struct acpi_buffer *ret_buffer)
@@ -222,12 +227,12 @@ EXPORT_SYMBOL(acpi_get_possible_resources);
  *
  * FUNCTION:    acpi_walk_resources
  *
- * PARAMETERS:  device_handle   - a handle to the device object for the
+ * PARAMETERS:  device_handle   - Handle to the device object for the
  *                                device we are querying
- *              Path            - method name of the resources we want
+ *              Name            - Method name of the resources we want
  *                                (METHOD_NAME__CRS or METHOD_NAME__PRS)
- *              user_function   - called for each resource
- *              Context         - passed to user_function
+ *              user_function   - Called for each resource
+ *              Context         - Passed to user_function
  *
  * RETURN:      Status
  *
@@ -239,79 +244,74 @@ EXPORT_SYMBOL(acpi_get_possible_resources);
 
 acpi_status
 acpi_walk_resources(acpi_handle device_handle,
-		    char *path,
+		    char *name,
 		    ACPI_WALK_RESOURCE_CALLBACK user_function, void *context)
 {
 	acpi_status status;
-	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	struct acpi_buffer buffer;
 	struct acpi_resource *resource;
-	struct acpi_resource *buffer_end;
+	struct acpi_resource *resource_end;
 
 	ACPI_FUNCTION_TRACE("acpi_walk_resources");
 
-	if (!device_handle ||
-	    (ACPI_STRNCMP(path, METHOD_NAME__CRS, sizeof(METHOD_NAME__CRS)) &&
-	     ACPI_STRNCMP(path, METHOD_NAME__PRS, sizeof(METHOD_NAME__PRS)))) {
+	/* Parameter validation */
+
+	if (!device_handle || !user_function || !name ||
+	    (ACPI_STRNCMP(name, METHOD_NAME__CRS, sizeof(METHOD_NAME__CRS)) &&
+	     ACPI_STRNCMP(name, METHOD_NAME__PRS, sizeof(METHOD_NAME__PRS)))) {
 		return_ACPI_STATUS(AE_BAD_PARAMETER);
 	}
 
-	status = acpi_rs_get_method_data(device_handle, path, &buffer);
+	/* Get the _CRS or _PRS resource list */
+
+	buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
+	status = acpi_rs_get_method_data(device_handle, name, &buffer);
 	if (ACPI_FAILURE(status)) {
 		return_ACPI_STATUS(status);
 	}
 
-	/* Setup pointers */
+	/* Buffer now contains the resource list */
 
-	resource = (struct acpi_resource *)buffer.pointer;
-	buffer_end = ACPI_CAST_PTR(struct acpi_resource,
-				   ((u8 *) buffer.pointer + buffer.length));
+	resource = ACPI_CAST_PTR(struct acpi_resource, buffer.pointer);
+	resource_end =
+	    ACPI_ADD_PTR(struct acpi_resource, buffer.pointer, buffer.length);
 
-	/* Walk the resource list */
+	/* Walk the resource list until the end_tag is found (or buffer end) */
 
-	for (;;) {
-		if (!resource || resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
+	while (resource < resource_end) {
+		/* Sanity check the resource */
+
+		if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
+			status = AE_AML_INVALID_RESOURCE_TYPE;
 			break;
 		}
 
-		status = user_function(resource, context);
-
-		switch (status) {
-		case AE_OK:
-		case AE_CTRL_DEPTH:
+		/* Invoke the user function, abort on any error returned */
 
-			/* Just keep going */
+		status = user_function(resource, context);
+		if (ACPI_FAILURE(status)) {
+			if (status == AE_CTRL_TERMINATE) {
+				/* This is an OK termination by the user function */
 
-			status = AE_OK;
+				status = AE_OK;
+			}
 			break;
+		}
 
-		case AE_CTRL_TERMINATE:
-
-			/* Exit now, with OK stats */
-
-			status = AE_OK;
-			goto cleanup;
-
-		default:
-
-			/* All others are valid exceptions */
+		/* end_tag indicates end-of-list */
 
-			goto cleanup;
+		if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
+			break;
 		}
 
 		/* Get the next resource descriptor */
 
-		resource = ACPI_NEXT_RESOURCE(resource);
-
-		/* Check for end-of-buffer */
-
-		if (resource >= buffer_end) {
-			goto cleanup;
-		}
+		resource =
+		    ACPI_ADD_PTR(struct acpi_resource, resource,
+				 resource->length);
 	}
 
-      cleanup:
-
-	acpi_os_free(buffer.pointer);
+	ACPI_MEM_FREE(buffer.pointer);
 	return_ACPI_STATUS(status);
 }
 
@@ -381,6 +381,12 @@ acpi_resource_to_address64(struct acpi_resource *resource,
 	struct acpi_resource_address16 *address16;
 	struct acpi_resource_address32 *address32;
 
+	if (!resource || !out) {
+		return (AE_BAD_PARAMETER);
+	}
+
+	/* Convert 16 or 32 address descriptor to 64 */
+
 	switch (resource->type) {
 	case ACPI_RESOURCE_TYPE_ADDRESS16:
 
@@ -410,3 +416,113 @@ acpi_resource_to_address64(struct acpi_resource *resource,
 }
 
 EXPORT_SYMBOL(acpi_resource_to_address64);
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_get_vendor_resource
+ *
+ * PARAMETERS:  device_handle       - Handle for the parent device object
+ *              Name                - Method name for the parent resource
+ *                                    (METHOD_NAME__CRS or METHOD_NAME__PRS)
+ *              Uuid                - Pointer to the UUID to be matched.
+ *                                    includes both subtype and 16-byte UUID
+ *              ret_buffer          - Where the vendor resource is returned
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Walk a resource template for the specified evice to find a
+ *              vendor-defined resource that matches the supplied UUID and
+ *              UUID subtype. Returns a struct acpi_resource of type Vendor.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_get_vendor_resource(acpi_handle device_handle,
+			 char *name,
+			 struct acpi_vendor_uuid * uuid,
+			 struct acpi_buffer * ret_buffer)
+{
+	struct acpi_vendor_walk_info info;
+	acpi_status status;
+
+	/* Other parameters are validated by acpi_walk_resources */
+
+	if (!uuid || !ret_buffer) {
+		return (AE_BAD_PARAMETER);
+	}
+
+	info.uuid = uuid;
+	info.buffer = ret_buffer;
+	info.status = AE_NOT_EXIST;
+
+	/* Walk the _CRS or _PRS resource list for this device */
+
+	status =
+	    acpi_walk_resources(device_handle, name,
+				acpi_rs_match_vendor_resource, &info);
+	if (ACPI_FAILURE(status)) {
+		return (status);
+	}
+
+	return (info.status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_rs_match_vendor_resource
+ *
+ * PARAMETERS:  ACPI_WALK_RESOURCE_CALLBACK
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Match a vendor resource via the ACPI 3.0 UUID
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context)
+{
+	struct acpi_vendor_walk_info *info = context;
+	struct acpi_resource_vendor_typed *vendor;
+	struct acpi_buffer *buffer;
+	acpi_status status;
+
+	/* Ignore all descriptors except Vendor */
+
+	if (resource->type != ACPI_RESOURCE_TYPE_VENDOR) {
+		return (AE_OK);
+	}
+
+	vendor = &resource->data.vendor_typed;
+
+	/*
+	 * For a valid match, these conditions must hold:
+	 *
+	 * 1) Length of descriptor data must be at least as long as a UUID struct
+	 * 2) The UUID subtypes must match
+	 * 3) The UUID data must match
+	 */
+	if ((vendor->byte_length < (ACPI_UUID_LENGTH + 1)) ||
+	    (vendor->uuid_subtype != info->uuid->subtype) ||
+	    (ACPI_MEMCMP(vendor->uuid, info->uuid->data, ACPI_UUID_LENGTH))) {
+		return (AE_OK);
+	}
+
+	/* Validate/Allocate/Clear caller buffer */
+
+	buffer = info->buffer;
+	status = acpi_ut_initialize_buffer(buffer, resource->length);
+	if (ACPI_FAILURE(status)) {
+		return (status);
+	}
+
+	/* Found the correct resource, copy and return it */
+
+	ACPI_MEMCPY(buffer->pointer, resource, resource->length);
+	buffer->length = resource->length;
+
+	/* Found the desired descriptor, terminate resource walk */
+
+	info->status = AE_OK;
+	return (AE_CTRL_TERMINATE);
+}