resource: store 'end' instead of 'size' in struct resource

Storing the size instead of the resource end in struct resource was
a mistake. 'size' ranges from 0 to UINT[32|64]_MAX + 1 which obviously
leads to problems. 'end' on the other hand will never exceed
UINT[32|64]_MAX. Also this way we can express a iomem region covering
the whole address space.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 4 insertions, 4 deletions

diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 3f95dddf4e..6d6cd68de6 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -17,7 +17,7 @@
  */
 struct resource {
 	resource_size_t start;
-	resource_size_t size;
+	resource_size_t end;
 	const char *name;
 	unsigned long flags;
 	struct resource *parent;
@@ -113,7 +113,7 @@ struct resource {
 
 static inline resource_size_t resource_size(const struct resource *res)
 {
-	return res->size;
+	return res->end - res->start + 1;
 }
 static inline unsigned long resource_type(const struct resource *res)
 {
@@ -121,10 +121,10 @@ static inline unsigned long resource_type(const struct resource *res)
 }
 
 struct resource *request_iomem_region(const char *name,
-		resource_size_t start, resource_size_t size);
+		resource_size_t start, resource_size_t end);
 
 struct resource *request_region(struct resource *parent,
-		const char *name, resource_size_t start,
+		const char *name, resource_size_t end,
 		resource_size_t size);
 
 int release_region(struct resource *res);