tun: avoid owner checks on IFF_ATTACH_QUEUE

[~andy/linux] / fs / namespace.c

diff --git a/fs/namespace.c b/fs/namespace.c
index 398a50ff243848fae1145c695d6decc801d80f7d..55605c552787cae1188ef93ee522ddd958e8cd83 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -313,7 +313,7 @@ int __mnt_want_write(struct vfsmount *m)
         * incremented count after it has set MNT_WRITE_HOLD.
         */
        smp_mb();
-       while (mnt->mnt.mnt_flags & MNT_WRITE_HOLD)
+       while (ACCESS_ONCE(mnt->mnt.mnt_flags) & MNT_WRITE_HOLD)
                cpu_relax();
        /*
         * After the slowpath clears MNT_WRITE_HOLD, mnt_is_readonly will