Merge tag 'gfs2-merge-window' of git://git.kernel.org/pub/scm/linux/kernel/git/steve...

[firefly-linux-kernel-4.4.55.git] / drivers / tty / tty_io.c

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 26bb78c30a00948fb08de571c8001ab9bf86ef36..a9355ce1c6d586cef3c9cd62641a141bfa91c245 100644 (file)
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -629,6 +629,11 @@ static void __tty_hangup(struct tty_struct *tty, int exit_session)
 
        tty_lock(tty);
 
+       if (test_bit(TTY_HUPPED, &tty->flags)) {
+               tty_unlock(tty);
+               return;
+       }
+
        /* some functions below drop BTM, so we need this bit */
        set_bit(TTY_HUPPING, &tty->flags);