resource: add release_child_resources

[net-next-2.6.git] / kernel / resource.c

diff --git a/kernel/resource.c b/kernel/resource.c
index af96c1e4b54b11b27fe445b834e3106b5b76b472..24e9e60c1459350bf5e6df4d2cc64daacedcfbeb 100644 (file)
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -188,6 +188,36 @@ static int __release_resource(struct resource *old)
        return -EINVAL;
 }
 
+static void __release_child_resources(struct resource *r)
+{
+       struct resource *tmp, *p;
+       resource_size_t size;
+
+       p = r->child;
+       r->child = NULL;
+       while (p) {
+               tmp = p;
+               p = p->sibling;
+
+               tmp->parent = NULL;
+               tmp->sibling = NULL;
+               __release_child_resources(tmp);
+
+               printk(KERN_DEBUG "release child resource %pR\n", tmp);
+               /* need to restore size, and keep flags */
+               size = resource_size(tmp);
+               tmp->start = 0;
+               tmp->end = size - 1;
+       }
+}
+
+void release_child_resources(struct resource *r)
+{
+       write_lock(&resource_lock);
+       __release_child_resources(r);
+       write_unlock(&resource_lock);
+}
+
 /**
  * request_resource - request and reserve an I/O or memory resource
  * @root: root resource descriptor
@@ -303,8 +333,10 @@ int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
 static int find_resource(struct resource *root, struct resource *new,
                         resource_size_t size, resource_size_t min,
                         resource_size_t max, resource_size_t align,
-                        void (*alignf)(void *, struct resource *,
-                                       resource_size_t, resource_size_t),
+                        resource_size_t (*alignf)(void *,
+                                                  const struct resource *,
+                                                  resource_size_t,
+                                                  resource_size_t),
                         void *alignf_data)
 {
        struct resource *this = root->child;
@@ -330,7 +362,7 @@ static int find_resource(struct resource *root, struct resource *new,
                        tmp.end = max;
                tmp.start = ALIGN(tmp.start, align);
                if (alignf)
-                       alignf(alignf_data, &tmp, size, align);
+                       tmp.start = alignf(alignf_data, &tmp, size, align);
                if (tmp.start < tmp.end && tmp.end - tmp.start >= size - 1) {
                        new->start = tmp.start;
                        new->end = tmp.start + size - 1;
@@ -358,8 +390,10 @@ static int find_resource(struct resource *root, struct resource *new,
 int allocate_resource(struct resource *root, struct resource *new,
                      resource_size_t size, resource_size_t min,
                      resource_size_t max, resource_size_t align,
-                     void (*alignf)(void *, struct resource *,
-                                    resource_size_t, resource_size_t),
+                     resource_size_t (*alignf)(void *,
+                                               const struct resource *,
+                                               resource_size_t,
+                                               resource_size_t),
                      void *alignf_data)
 {
        int err;