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);
+}