#include <linux/pci.h>
 #include <linux/init.h>
 #include <linux/bitops.h>
+#include <linux/completion.h>
 
 #include <asm/system.h>
 #include <asm/io.h>
        struct tty_struct *tty;
        int cflag;
        wait_queue_head_t open_wait;
-       wait_queue_head_t close_wait;
+       struct completion close_wait;
 
        struct timer_list emptyTimer;
 
                ch->closing_wait = 30 * HZ;
                ch->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
                init_waitqueue_head(&ch->open_wait);
-               init_waitqueue_head(&ch->close_wait);
+               init_completion(&ch->close_wait);
 
                setup_timer(&ch->emptyTimer, moxa_check_xmit_empty,
                                (unsigned long)ch);
                wake_up_interruptible(&ch->open_wait);
        }
        ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
-       wake_up_interruptible(&ch->close_wait);
+       complete_all(&ch->close_wait);
 }
 
 static int moxa_write(struct tty_struct *tty,
         */
        if (tty_hung_up_p(filp) || (ch->asyncflags & ASYNC_CLOSING)) {
                if (ch->asyncflags & ASYNC_CLOSING)
-                       interruptible_sleep_on(&ch->close_wait);
+                       wait_for_completion_interruptible(&ch->close_wait);
 #ifdef SERIAL_DO_RESTART
                if (ch->asyncflags & ASYNC_HUP_NOTIFY)
                        return (-EAGAIN);