Sanitize autofs_dev_ioctl_ismountpoint()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index 00bf8fc..c8a80df 100644 (file)
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -544,10 +544,9 @@ static int autofs_dev_ioctl_ismountpoint(struct file *fp,
                        goto out;
                devid = new_encode_dev(path.mnt->mnt_sb->s_dev);
                err = 0;
-               if (path.dentry->d_inode &&
-                   path.mnt->mnt_root == path.dentry) {
+               if (path.mnt->mnt_root == path.dentry) {
                        err = 1;
-                       magic = path.dentry->d_inode->i_sb->s_magic;
+                       magic = path.mnt->mnt_sb->s_magic;
                }
        } else {
                dev_t dev = sbi->sb->s_dev;
@@ -560,10 +559,8 @@ static int autofs_dev_ioctl_ismountpoint(struct file *fp,
 
                err = have_submounts(path.dentry);
 
-               if (path.mnt->mnt_mountpoint != path.mnt->mnt_root) {
-                       if (follow_down(&path))
-                               magic = path.mnt->mnt_sb->s_magic;
-               }
+               if (follow_down(&path))
+                       magic = path.mnt->mnt_sb->s_magic;
        }
 
        param->ismountpoint.out.devid = devid;