USB: iuu_phoenix: lock priv->tiostatus properly

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/iuu_phoenix.c b/drivers/usb/serial/iuu_phoenix.c
index fde188e..a09b9a8 100644 (file)
--- a/drivers/usb/serial/iuu_phoenix.c
+++ b/drivers/usb/serial/iuu_phoenix.c
@@ -148,20 +148,21 @@ static int iuu_tiocmset(struct usb_serial_port *port, struct file *file,
                        unsigned int set, unsigned int clear)
 {
        struct iuu_private *priv = usb_get_serial_port_data(port);
-       struct tty_struct *tty;
-       tty = port->tty;
+       unsigned long flags;
 
+       /* FIXME: locking on tiomstatus */
        dbg("%s (%d) msg : SET = 0x%04x, CLEAR = 0x%04x ", __FUNCTION__,
            port->number, set, clear);
+
+       spin_lock_irqsave(&priv->lock, flags);
        if (set & TIOCM_RTS)
                priv->tiostatus = TIOCM_RTS;
 
        if (!(set & TIOCM_RTS) && priv->tiostatus == TIOCM_RTS) {
                dbg("%s TIOCMSET RESET called !!!", __FUNCTION__);
                priv->reset = 1;
-               return 0;
        }
-
+       spin_unlock_irqrestore(&priv->lock, flags);
        return 0;
 }
 
@@ -173,7 +174,14 @@ static int iuu_tiocmset(struct usb_serial_port *port, struct file *file,
 static int iuu_tiocmget(struct usb_serial_port *port, struct file *file)
 {
        struct iuu_private *priv = usb_get_serial_port_data(port);
-       return priv->tiostatus;
+       unsigned long flags;
+       int rc;
+
+       spin_lock_irqsave(&priv->lock, flags);
+       rc = priv->tiostatus;
+       spin_unlock_irqrestore(&priv->lock, flags);
+
+       return rc;
 }
 
 static void iuu_rxcmd(struct urb *urb)