1 files changed, 62 insertions, 0 deletions

diff --git a/kernel/resource.c b/kernel/resource.c
index 7b9a497419d9..2a3f88636580 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -17,6 +17,7 @@
 #include <linux/fs.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
+#include <linux/device.h>
 #include <asm/io.h>
 
 
@@ -618,6 +619,67 @@ void __release_region(struct resource *parent, resource_size_t start,
 EXPORT_SYMBOL(__release_region);
 
 /*
+ * Managed region resource
+ */
+struct region_devres {
+        struct resource *parent;
+        resource_size_t start;
+        resource_size_t n;
+};
+
+static void devm_region_release(struct device *dev, void *res)
+{
+        struct region_devres *this = res;
+
+        __release_region(this->parent, this->start, this->n);
+}
+
+static int devm_region_match(struct device *dev, void *res, void *match_data)
+{
+        struct region_devres *this = res, *match = match_data;
+
+        return this->parent == match->parent &&
+                this->start == match->start && this->n == match->n;
+}
+
+struct resource * __devm_request_region(struct device *dev,
+                                struct resource *parent, resource_size_t start,
+                                resource_size_t n, const char *name)
+{
+        struct region_devres *dr = NULL;
+        struct resource *res;
+
+        dr = devres_alloc(devm_region_release, sizeof(struct region_devres),
+                          GFP_KERNEL);
+        if (!dr)
+                return NULL;
+
+        dr->parent = parent;
+        dr->start = start;
+        dr->n = n;
+
+        res = __request_region(parent, start, n, name);
+        if (res)
+                devres_add(dev, dr);
+        else
+                devres_free(dr);
+
+        return res;
+}
+EXPORT_SYMBOL(__devm_request_region);
+
+void __devm_release_region(struct device *dev, struct resource *parent,
+                           resource_size_t start, resource_size_t n)
+{
+        struct region_devres match_data = { parent, start, n };
+
+        __release_region(parent, start, n);
+        WARN_ON(devres_destroy(dev, devm_region_release, devm_region_match,
+                               &match_data));
+}
+EXPORT_SYMBOL(__devm_release_region);
+
+/*
  * Called from init/main.c to reserve IO ports.
  */
 #define MAXRESERVE 4