1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 74d9a0258d7c..642239015b46 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -2964,6 +2964,10 @@ static void gsmtty_close(struct tty_struct *tty, struct file *filp)
         if (tty_port_close_start(&dlci->port, tty, filp) == 0)
                 goto out;
         gsm_dlci_begin_close(dlci);
+        if (test_bit(ASYNCB_INITIALIZED, &dlci->port.flags)) {
+                if (C_HUPCL(tty))
+                        tty_port_lower_dtr_rts(&dlci->port);
+        }
         tty_port_close_end(&dlci->port, tty);
         tty_port_tty_set(&dlci->port, NULL);
 out: