1 files changed, 4 insertions, 32 deletions

diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index 7c4917d77c0..7b538caec37 100644
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -216,12 +216,13 @@ static void mos7720_bulk_in_callback(struct urb *urb)
 
         data = urb->transfer_buffer;
 
-        tty = port->port.tty;
+        tty = tty_port_tty_get(&port->port);
         if (tty && urb->actual_length) {
                 tty_buffer_request_room(tty, urb->actual_length);
                 tty_insert_flip_string(tty, data, urb->actual_length);
                 tty_flip_buffer_push(tty);
         }
+        tty_kref_put(tty);
 
         if (!port->read_urb) {
                 dbg("URB KILLED !!!");
@@ -262,10 +263,11 @@ static void mos7720_bulk_out_data_callback(struct urb *urb)
 
         dbg("Entering .........");
 
-        tty = mos7720_port->port->port.tty;
+        tty = tty_port_tty_get(&mos7720_port->port->port);
 
         if (tty && mos7720_port->open)
                 tty_wakeup(tty);
+        tty_kref_put(tty);
 }
 
 /*
@@ -1267,29 +1269,6 @@ static int get_lsr_info(struct tty_struct *tty,
         return 0;
 }
 
-/*
- * get_number_bytes_avail - get number of bytes available
- *
- * Purpose: Let user call ioctl to get the count of number of bytes available.
- */
-static int get_number_bytes_avail(struct moschip_port *mos7720_port,
-                                  unsigned int __user *value)
-{
-        unsigned int result = 0;
-        struct tty_struct *tty = mos7720_port->port->port.tty;
-
-        if (!tty)
-                return -ENOIOCTLCMD;
-
-        result = tty->read_cnt;
-
-        dbg("%s(%d) = %d", __func__,  mos7720_port->port->number, result);
-        if (copy_to_user(value, &result, sizeof(int)))
-                return -EFAULT;
-
-        return -ENOIOCTLCMD;
-}
-
 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
                           unsigned int __user *value)
 {
@@ -1409,13 +1388,6 @@ static int mos7720_ioctl(struct tty_struct *tty, struct file *file,
         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
 
         switch (cmd) {
-        case TIOCINQ:
-                /* return number of bytes available */
-                dbg("%s (%d) TIOCINQ", __func__,  port->number);
-                return get_number_bytes_avail(mos7720_port,
-                                              (unsigned int __user *)arg);
-                break;
-
         case TIOCSERGETLSR:
                 dbg("%s (%d) TIOCSERGETLSR", __func__,  port->number);
                 return get_lsr_info(tty, mos7720_port,