2 files changed, 4 insertions, 11 deletions

diff --git a/drivers/usb/class/Kconfig b/drivers/usb/class/Kconfig
index 2519e320098f..316aac8e4ca1 100644
--- a/drivers/usb/class/Kconfig
+++ b/drivers/usb/class/Kconfig
@@ -6,7 +6,7 @@ comment "USB Device Class drivers"
 
 config USB_ACM
         tristate "USB Modem (CDC ACM) support"
-        depends on USB
+        depends on USB && TTY
         ---help---
           This driver supports USB modems and ISDN adapters which support the
           Communication Device Class Abstract Control Model interface.
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 2d92cce260d7..8ac25adf31b4 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -410,19 +410,12 @@ static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 
 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 {
-        struct tty_struct *tty;
-
         if (!urb->actual_length)
                 return;
 
-        tty = tty_port_tty_get(&acm->port);
-        if (!tty)
-                return;
-
-        tty_insert_flip_string(tty, urb->transfer_buffer, urb->actual_length);
-        tty_flip_buffer_push(tty);
-
-        tty_kref_put(tty);
+        tty_insert_flip_string(&acm->port, urb->transfer_buffer,
+                        urb->actual_length);
+        tty_flip_buffer_push(&acm->port);
 }
 
 static void acm_read_bulk_callback(struct urb *urb)