Documentation: configfs examples crash fix

When configfs_register_subsystem() fails, we unregister too many
subsystems in configfs_example_init.  Decrement i by one to not unregister
non-registered subsystem.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 4 insertions, 8 deletions

diff --git a/Documentation/filesystems/configfs/configfs_example_explicit.c b/Documentation/filesystems/configfs/configfs_example_explicit.c
index fd53869f5633..1420233dfa55 100644
--- a/Documentation/filesystems/configfs/configfs_example_explicit.c
+++ b/Documentation/filesystems/configfs/configfs_example_explicit.c
@@ -464,9 +464,8 @@ static int __init configfs_example_init(void)
         return 0;
 
 out_unregister:
-        for (; i >= 0; i--) {
+        for (i--; i >= 0; i--)
                 configfs_unregister_subsystem(example_subsys[i]);
-        }
 
         return ret;
 }
@@ -475,9 +474,8 @@ static void __exit configfs_example_exit(void)
 {
         int i;
 
-        for (i = 0; example_subsys[i]; i++) {
+        for (i = 0; example_subsys[i]; i++)
                 configfs_unregister_subsystem(example_subsys[i]);
-        }
 }
 
 module_init(configfs_example_init);
diff --git a/Documentation/filesystems/configfs/configfs_example_macros.c b/Documentation/filesystems/configfs/configfs_example_macros.c
index d8e30a0378aa..327dfbc640a9 100644
--- a/Documentation/filesystems/configfs/configfs_example_macros.c
+++ b/Documentation/filesystems/configfs/configfs_example_macros.c
@@ -427,9 +427,8 @@ static int __init configfs_example_init(void)
         return 0;
 
 out_unregister:
-        for (; i >= 0; i--) {
+        for (i--; i >= 0; i--)
                 configfs_unregister_subsystem(example_subsys[i]);
-        }
 
         return ret;
 }
@@ -438,9 +437,8 @@ static void __exit configfs_example_exit(void)
 {
         int i;
 
-        for (i = 0; example_subsys[i]; i++) {
+        for (i = 0; example_subsys[i]; i++)
                 configfs_unregister_subsystem(example_subsys[i]);
-        }
 }
 
 module_init(configfs_example_init);