configfs: Convert subsystem semaphore to mutex

Convert the su_sem member of struct configfs_subsystem to a struct
mutex, as that's what it is. Also convert all the users and update
Documentation/configfs.txt and Documentation/configfs_example.c
accordingly.

[ Conflict in fs/dlm/config.c with commit
  3168b0780d06ace875696f8a648d04d6089654e5 manually resolved. --Mark ]

Inspired-by: Satyam Sharma <ssatyam@cse.iitk.ac.in>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/configfs.h b/include/linux/configfs.h
index bbb1b6cafa8b..5ce0fc4e3b5b 100644
--- a/include/linux/configfs.h
+++ b/include/linux/configfs.h
@@ -40,9 +40,9 @@
 #include <linux/types.h>
 #include <linux/list.h>
 #include <linux/kref.h>
+#include <linux/mutex.h>
 
 #include <asm/atomic.h>
-#include <asm/semaphore.h>
 
 #define CONFIGFS_ITEM_NAME_LEN  20
 
@@ -174,7 +174,7 @@ struct configfs_group_operations {
 
 struct configfs_subsystem {
         struct config_group     su_group;
-        struct semaphore        su_sem;
+        struct mutex            su_mutex;
 };
 
 static inline struct configfs_subsystem *to_configfs_subsystem(struct config_group *group)