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, 5 insertions, 5 deletions

diff --git a/fs/dlm/config.c b/fs/dlm/config.c
index 4348cb42cf17..2f8e3c81bc19 100644
--- a/fs/dlm/config.c
+++ b/fs/dlm/config.c
@@ -607,7 +607,7 @@ static struct clusters clusters_root = {
 int dlm_config_init(void)
 {
         config_group_init(&clusters_root.subsys.su_group);
-        init_MUTEX(&clusters_root.subsys.su_sem);
+        mutex_init(&clusters_root.subsys.su_mutex);
         return configfs_register_subsystem(&clusters_root.subsys);
 }
 
@@ -751,9 +751,9 @@ static struct space *get_space(char *name)
         if (!space_list)
                 return NULL;
 
-        down(&space_list->cg_subsys->su_sem);
+        mutex_lock(&space_list->cg_subsys->su_mutex);
         i = config_group_find_item(space_list, name);
-        up(&space_list->cg_subsys->su_sem);
+        mutex_unlock(&space_list->cg_subsys->su_mutex);
 
         return to_space(i);
 }
@@ -772,7 +772,7 @@ static struct comm *get_comm(int nodeid, struct sockaddr_storage *addr)
         if (!comm_list)
                 return NULL;
 
-        down(&clusters_root.subsys.su_sem);
+        mutex_lock(&clusters_root.subsys.su_mutex);
 
         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
                 cm = to_comm(i);
@@ -792,7 +792,7 @@ static struct comm *get_comm(int nodeid, struct sockaddr_storage *addr)
                         break;
                 }
         }
-        up(&clusters_root.subsys.su_sem);
+        mutex_unlock(&clusters_root.subsys.su_mutex);
 
         if (!found)
                 cm = NULL;