[PATCH v2 14/16] xen/xenbus: move to_xenbus_device() to use container_of_const()

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

The driver core is changing to pass some pointers as const, so move
to_xenbus_device() to use container_of_const() to handle this change.

to_xenbus_device() now properly keeps the const-ness of the pointer passed
into it, while as before it could be lost.

Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 include/xen/xenbus.h | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/include/xen/xenbus.h b/include/xen/xenbus.h
index eaa932b99d8a..b31f77f9c50c 100644
--- a/include/xen/xenbus.h
+++ b/include/xen/xenbus.h
@@ -96,10 +96,7 @@ struct xenbus_device {
        unsigned int spurious_threshold;
 };
 
-static inline struct xenbus_device *to_xenbus_device(struct device *dev)
-{
-       return container_of(dev, struct xenbus_device, dev);
-}
+#define to_xenbus_device(__dev)        container_of_const(__dev, struct 
xenbus_device, dev)
 
 struct xenbus_device_id
 {
-- 
2.39.0