memstick: add "start" and "stop" methods to memstick device

In some cases it may be desirable to ensure that associated driver is not
going to access the media in some period of time.  "start" and "stop"
methods are provided therefore to allow it.

Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/memstick.h b/include/linux/memstick.h
index 2fe599c66d52..a9f998a3f48b 100644
--- a/include/linux/memstick.h
+++ b/include/linux/memstick.h
@@ -263,6 +263,10 @@ struct memstick_dev {
         /* Get next request from the media driver.                         */
         int                      (*next_request)(struct memstick_dev *card,
                                                  struct memstick_request **mrq);
+        /* Tell the media driver to stop doing things                      */
+        void                     (*stop)(struct memstick_dev *card);
+        /* Allow the media driver to continue                              */
+        void                     (*start)(struct memstick_dev *card);
 
         struct device            dev;
 };