1 files changed, 11 insertions, 5 deletions

diff --git a/fs/super.c b/fs/super.c
index 2a49fed77453..a64f36208797 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -542,25 +542,33 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
         shrink_dcache_sb(sb);
         sync_filesystem(sb);
 
+        lock_kernel();
         /* If we are remounting RDONLY and current sb is read/write,
            make sure there are no rw files opened */
         if ((flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY)) {
                 if (force)
                         mark_files_ro(sb);
-                else if (!fs_may_remount_ro(sb))
+                else if (!fs_may_remount_ro(sb)) {
+                        unlock_kernel();
                         return -EBUSY;
+                }
                 retval = vfs_dq_off(sb, 1);
-                if (retval < 0 && retval != -ENOSYS)
+                if (retval < 0 && retval != -ENOSYS) {
+                        unlock_kernel();
                         return -EBUSY;
+                }
         }
         remount_rw = !(flags & MS_RDONLY) && (sb->s_flags & MS_RDONLY);
 
         if (sb->s_op->remount_fs) {
                 retval = sb->s_op->remount_fs(sb, &flags, data);
-                if (retval)
+                if (retval) {
+                        unlock_kernel();
                         return retval;
+                }
         }
         sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK);
+        unlock_kernel();
         if (remount_rw)
                 vfs_dq_quota_on_remount(sb);
         return 0;
@@ -581,9 +589,7 @@ static void do_emergency_remount(struct work_struct *work)
                          *
                          * What lock protects sb->s_flags??
                          */
-                        lock_kernel();
                         do_remount_sb(sb, MS_RDONLY, NULL, 1);
-                        unlock_kernel();
                 }
                 up_write(&sb->s_umount);
                 put_super(sb);