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authorYinghai Lu <yinghai@kernel.org>2009-12-22 15:02:22 -0800
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-02-22 16:17:00 -0800
commit5eeec0ec931a01e85b3701ce121b7d8a1800ec60 (patch)
tree2efe474832b68a97c0460fc7f5e58a488f977dbb /kernel/resource.c
parent7cc5997d1dada3bdeed95a59c2f4f6c66cbb0767 (diff)
downloadlinux-5eeec0ec931a01e85b3701ce121b7d8a1800ec60.tar.gz
resource: add release_child_resources
Useful for freeing a portion of the resource tree, e.g. when trying to
reallocate resources more efficiently.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'kernel/resource.c')
-rw-r--r--kernel/resource.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/kernel/resource.c b/kernel/resource.c
index 7fd123ad00aa..24e9e60c1459 100644
--- 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