Index: kernel/resource.c
===================================================================
RCS file: /var/cvs/linux-2.6/kernel/resource.c,v
retrieving revision 1.4
diff -u -p -r1.4 resource.c
--- kernel/resource.c 28 Sep 2003 04:06:24 -0000 1.4
+++ kernel/resource.c 2 Oct 2003 22:17:40 -0000
@@ -317,6 +317,57 @@ int expand_resource(struct resource *res
return 0;
}
+/**
+ * insert_resource - Inserts a resource between two existing resources
+ * @parent
+ * @new
+ *
+ * Returns 0 on success, -EBUSY if the resource can't be inserted.
+ */
+int insert_resource(struct resource *parent, struct resource *new)
+{
+ int result = 0;
+ struct resource *first, *next;
+
+ write_lock(&resource_lock);
+ first = __request_resource(parent, new);
+ if (!first)
+ goto out;
+
+ result = -EBUSY;
+ if (first == parent)
+ goto out;
+
+ for (next = first; next && next->end <= new->end; next = next->sibling)
+ if (new->end < next->start)
+ break;
+
+ /* existing resource overlaps end of new resource */
+ if (next && next->end > new->end)
+ goto out;
+
+ result = 0;
+ if (next) {
+ new->sibling = next->sibling;
+ next->sibling = NULL;
+ }
+ new->child = first;
+ for (next = first; next; next = next->sibling)
+ next->parent = new;
+ if (parent->child == first) {
+ parent->child = new;
+ } else {
+ next = parent->child;
+ while (next->sibling != first)
+ next = next->sibling;
+ next->sibling = new;
+ }
+
+ out:
+ write_unlock(&resource_lock);
+ return result;
+}
+
/*
* This is compatibility stuff for IO resources.
*
