1 files changed, 7 insertions, 7 deletions

diff --git a/drivers/usb/serial/kobil_sct.c b/drivers/usb/serial/kobil_sct.c
index bd5bd8589e04..ddd146300ddb 100644
--- a/drivers/usb/serial/kobil_sct.c
+++ b/drivers/usb/serial/kobil_sct.c
@@ -75,10 +75,10 @@ static void kobil_close(struct usb_serial_port *port);
 static int  kobil_write(struct tty_struct *tty, struct usb_serial_port *port,
                          const unsigned char *buf, int count);
 static int  kobil_write_room(struct tty_struct *tty);
-static int  kobil_ioctl(struct tty_struct *tty, struct file *file,
+static int  kobil_ioctl(struct tty_struct *tty,
                         unsigned int cmd, unsigned long arg);
-static int  kobil_tiocmget(struct tty_struct *tty, struct file *file);
-static int  kobil_tiocmset(struct tty_struct *tty, struct file *file,
+static int  kobil_tiocmget(struct tty_struct *tty);
+static int  kobil_tiocmset(struct tty_struct *tty,
                            unsigned int set, unsigned int clear);
 static void kobil_read_int_callback(struct urb *urb);
 static void kobil_write_callback(struct urb *purb);
@@ -372,7 +372,7 @@ static void kobil_read_int_callback(struct urb *urb)
         }
 
         tty = tty_port_tty_get(&port->port);
-        if (urb->actual_length) {
+        if (tty && urb->actual_length) {
 
                 /* BEGIN DEBUG */
                 /*
@@ -504,7 +504,7 @@ static int kobil_write_room(struct tty_struct *tty)
 }
 
 
-static int kobil_tiocmget(struct tty_struct *tty, struct file *file)
+static int kobil_tiocmget(struct tty_struct *tty)
 {
         struct usb_serial_port *port = tty->driver_data;
         struct kobil_private *priv;
@@ -544,7 +544,7 @@ static int kobil_tiocmget(struct tty_struct *tty, struct file *file)
         return result;
 }
 
-static int kobil_tiocmset(struct tty_struct *tty, struct file *file,
+static int kobil_tiocmset(struct tty_struct *tty,
                            unsigned int set, unsigned int clear)
 {
         struct usb_serial_port *port = tty->driver_data;
@@ -668,7 +668,7 @@ static void kobil_set_termios(struct tty_struct *tty,
                 );
 }
 
-static int kobil_ioctl(struct tty_struct *tty, struct file *file,
+static int kobil_ioctl(struct tty_struct *tty,
                                         unsigned int cmd, unsigned long arg)
 {
         struct usb_serial_port *port = tty->driver_data;