[SPARC]: sbus/aurora: replace schedule_timeout() with msleep_interruptible()

Use msleep_interruptible() instead of
schedule_timeout() to guarantee the task delays as expected.
Signed-off-by: NNishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: NMaximilian Attems <janitor@sternwelten.at>
Signed-off-by: NDomen Puncer <domen@coderock.org>

drivers/sbus/char/aurora.c

@@ -1515,8 +1515,7 @@ static void aurora_close(struct tty_struct * tty, struct file * filp)
 		 */
 		timeout = jiffies+HZ;
 		while(port->SRER & SRER_TXEMPTY)  {
-			current->state = TASK_INTERRUPTIBLE;
-			schedule_timeout(port->timeout);
+			msleep_interruptible(jiffies_to_msecs(port->timeout));
 			if (time_after(jiffies, timeout))
 				break;
 		}
@@ -1533,8 +1532,7 @@ static void aurora_close(struct tty_struct * tty, struct file * filp)
 	port->tty = 0;
 	if (port->blocked_open) {
 		if (port->close_delay) {
-			current->state = TASK_INTERRUPTIBLE;
-			schedule_timeout(port->close_delay);
+			msleep_interruptible(jiffies_to_msecs(port->close_delay));
 		}
 		wake_up_interruptible(&port->open_wait);
 	}