USB: mct_u232: clean up read implementation

The device uses the second interrupt-in endpoint of the interface for
reading. Stop abusing the port read urb and store a pointer to the
second interrupt-in urb as port-private data instead.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
index 3353c9e..6a15adf 100644 (file)
--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -43,7 +43,6 @@
 /*
  * Function prototypes
  */
-static int  mct_u232_startup(struct usb_serial *serial);
 static int  mct_u232_port_probe(struct usb_serial_port *port);
 static int  mct_u232_port_remove(struct usb_serial_port *remove);
 static int  mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port);
@@ -91,7 +90,6 @@ static struct usb_serial_driver mct_u232_device = {
        .tiocmget =          mct_u232_tiocmget,
        .tiocmset =          mct_u232_tiocmset,
        .tiocmiwait =        usb_serial_generic_tiocmiwait,
-       .attach =            mct_u232_startup,
        .port_probe =        mct_u232_port_probe,
        .port_remove =       mct_u232_port_remove,
        .get_icount =        usb_serial_generic_get_icount,
@@ -102,6 +100,7 @@ static struct usb_serial_driver * const serial_drivers[] = {
 };
 
 struct mct_u232_private {
+       struct urb *read_urb;
        spinlock_t lock;
        unsigned int         control_state; /* Modem Line Setting (TIOCM) */
        unsigned char        last_lcr;      /* Line Control Register */
@@ -376,22 +375,6 @@ static void mct_u232_msr_to_state(struct usb_serial_port *port,
  * Driver's tty interface functions
  */
 
-static int mct_u232_startup(struct usb_serial *serial)
-{
-       struct usb_serial_port *port, *rport;
-
-       /* Puh, that's dirty */
-       port = serial->port[0];
-       rport = serial->port[1];
-       /* No unlinking, it wasn't submitted yet. */
-       usb_free_urb(port->read_urb);
-       port->read_urb = rport->interrupt_in_urb;
-       rport->interrupt_in_urb = NULL;
-       port->read_urb->context = port;
-
-       return 0;
-} /* mct_u232_startup */
-
 static int mct_u232_port_probe(struct usb_serial_port *port)
 {
        struct mct_u232_private *priv;
@@ -400,6 +383,10 @@ static int mct_u232_port_probe(struct usb_serial_port *port)
        if (!priv)
                return -ENOMEM;
 
+       /* Use second interrupt-in endpoint for reading. */
+       priv->read_urb = port->serial->port[1]->interrupt_in_urb;
+       priv->read_urb->context = port;
+
        spin_lock_init(&priv->lock);
 
        usb_set_serial_port_data(port, priv);
@@ -463,17 +450,17 @@ static int  mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port)
        mct_u232_msr_to_state(port, &priv->control_state, priv->last_msr);
        spin_unlock_irqrestore(&priv->lock, flags);
 
-       retval = usb_submit_urb(port->read_urb, GFP_KERNEL);
+       retval = usb_submit_urb(priv->read_urb, GFP_KERNEL);
        if (retval) {
                dev_err(&port->dev,
-                       "usb_submit_urb(read bulk) failed pipe 0x%x err %d\n",
+                       "usb_submit_urb(read) failed pipe 0x%x err %d\n",
                        port->read_urb->pipe, retval);
                goto error;
        }
 
        retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
        if (retval) {
-               usb_kill_urb(port->read_urb);
+               usb_kill_urb(priv->read_urb);
                dev_err(&port->dev,
                        "usb_submit_urb(read int) failed pipe 0x%x err %d",
                        port->interrupt_in_urb->pipe, retval);
@@ -503,11 +490,9 @@ static void mct_u232_dtr_rts(struct usb_serial_port *port, int on)
 
 static void mct_u232_close(struct usb_serial_port *port)
 {
-       /*
-        * Must kill the read urb as it is actually an interrupt urb, which
-        * generic close thus fails to kill.
-        */
-       usb_kill_urb(port->read_urb);
+       struct mct_u232_private *priv = usb_get_serial_port_data(port);
+
+       usb_kill_urb(priv->read_urb);
        usb_kill_urb(port->interrupt_in_urb);
 
        usb_serial_generic_close(port);