1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 0147ea39340e..1ded83b66af0 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -489,6 +489,7 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp)
         else
                 rv = 0;
 
+        set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
         tty->driver_data = acm;
         acm->tty = tty;