usb/io_edgeport: replace

@@ -261,6 +261,7 @@
 #include <linux/spinlock.h>
 #include <linux/serial.h>
 #include <linux/ioctl.h>
+#include <linux/wait.h>
 #include <asm/uaccess.h>
 #include <linux/usb.h>
 #include "usb-serial.h"

@@ -991,7 +992,6 @@ static int edge_open (struct usb_serial_
 	struct usb_serial *serial;
 	struct edgeport_serial *edge_serial;
 	int response;
-	int timeout;
 
 	dbg("%s - port %d", __FUNCTION__, port->number);
 

@@ -1073,10 +1073,7 @@ static int edge_open (struct usb_serial_
 	}
 
 	/* now wait for the port to be completely opened */
-	timeout = OPEN_TIMEOUT;
-	while (timeout && edge_port->openPending == TRUE) {
-		timeout = interruptible_sleep_on_timeout (&edge_port->wait_open, timeout);
-	}
+	wait_event_timeout(edge_port->wait_open, (edge_port->openPending != TRUE), OPEN_TIMEOUT);
 
 	if (edge_port->open == FALSE) {
 		/* open timed out */