|
@@ -1248,6 +1248,76 @@ int release_mem_region_adjustable(struct resource *parent,
|
|
|
/*
|
|
|
* Managed region resource
|
|
|
*/
|
|
|
+static void devm_resource_release(struct device *dev, void *ptr)
|
|
|
+{
|
|
|
+ struct resource **r = ptr;
|
|
|
+
|
|
|
+ release_resource(*r);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * devm_request_resource() - request and reserve an I/O or memory resource
|
|
|
+ * @dev: device for which to request the resource
|
|
|
+ * @root: root of the resource tree from which to request the resource
|
|
|
+ * @new: descriptor of the resource to request
|
|
|
+ *
|
|
|
+ * This is a device-managed version of request_resource(). There is usually
|
|
|
+ * no need to release resources requested by this function explicitly since
|
|
|
+ * that will be taken care of when the device is unbound from its driver.
|
|
|
+ * If for some reason the resource needs to be released explicitly, because
|
|
|
+ * of ordering issues for example, drivers must call devm_release_resource()
|
|
|
+ * rather than the regular release_resource().
|
|
|
+ *
|
|
|
+ * When a conflict is detected between any existing resources and the newly
|
|
|
+ * requested resource, an error message will be printed.
|
|
|
+ *
|
|
|
+ * Returns 0 on success or a negative error code on failure.
|
|
|
+ */
|
|
|
+int devm_request_resource(struct device *dev, struct resource *root,
|
|
|
+ struct resource *new)
|
|
|
+{
|
|
|
+ struct resource *conflict, **ptr;
|
|
|
+
|
|
|
+ ptr = devres_alloc(devm_resource_release, sizeof(*ptr), GFP_KERNEL);
|
|
|
+ if (!ptr)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ *ptr = new;
|
|
|
+
|
|
|
+ conflict = request_resource_conflict(root, new);
|
|
|
+ if (conflict) {
|
|
|
+ dev_err(dev, "resource collision: %pR conflicts with %s %pR\n",
|
|
|
+ new, conflict->name, conflict);
|
|
|
+ devres_free(ptr);
|
|
|
+ return -EBUSY;
|
|
|
+ }
|
|
|
+
|
|
|
+ devres_add(dev, ptr);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL(devm_request_resource);
|
|
|
+
|
|
|
+static int devm_resource_match(struct device *dev, void *res, void *data)
|
|
|
+{
|
|
|
+ struct resource **ptr = res;
|
|
|
+
|
|
|
+ return *ptr == data;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * devm_release_resource() - release a previously requested resource
|
|
|
+ * @dev: device for which to release the resource
|
|
|
+ * @new: descriptor of the resource to release
|
|
|
+ *
|
|
|
+ * Releases a resource previously requested using devm_request_resource().
|
|
|
+ */
|
|
|
+void devm_release_resource(struct device *dev, struct resource *new)
|
|
|
+{
|
|
|
+ WARN_ON(devres_release(dev, devm_resource_release, devm_resource_match,
|
|
|
+ new));
|
|
|
+}
|
|
|
+EXPORT_SYMBOL(devm_release_resource);
|
|
|
+
|
|
|
struct region_devres {
|
|
|
struct resource *parent;
|
|
|
resource_size_t start;
|