sound: oss: midibuf: fix sleep_on races

sleep_on is known to be racy and going away because of this. All instances
of interruptible_sleep_on and interruptible_sleep_on_timeout in the midibuf
driver can trivially be replaced with wait_event_interruptible and
wait_event_interruptible_timeout.

[fixed coding style warnings by tiwai]

Signed-off-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

sound/oss/midibuf.c

···
 	 */
 
 	if (midi_devs[dev]->buffer_status != NULL)
-		while (!signal_pending(current) && midi_devs[dev]->buffer_status(dev)) 
-			interruptible_sleep_on_timeout(&midi_sleeper[dev],
-						       HZ/10);
+		wait_event_interruptible_timeout(midi_sleeper[dev],
+				!midi_devs[dev]->buffer_status(dev), HZ/10);
 }
 
 static void midi_input_intr(int dev, unsigned char data)
···
 							   * devices
 							 */
 
-		while (!signal_pending(current) && DATA_AVAIL(midi_out_buf[dev]))
-			  interruptible_sleep_on(&midi_sleeper[dev]);
+		wait_event_interruptible(midi_sleeper[dev],
+					 !DATA_AVAIL(midi_out_buf[dev]));
 		/*
 		 *	Sync
 		 */
···
 				goto out;
 			}
 
-			interruptible_sleep_on(&midi_sleeper[dev]);
-			if (signal_pending(current)) 
+			if (wait_event_interruptible(midi_sleeper[dev],
+						SPACE_AVAIL(midi_out_buf[dev])))
 			{
 				c = -EINTR;
 				goto out;
···
  			c = -EAGAIN;
 			goto out;
  		}
-		interruptible_sleep_on_timeout(&input_sleeper[dev],
-					       parms[dev].prech_timeout);
+		wait_event_interruptible_timeout(input_sleeper[dev],
+						 DATA_AVAIL(midi_in_buf[dev]),
+						 parms[dev].prech_timeout);
 
 		if (signal_pending(current))
 			c = -EINTR;	/* The user is getting restless */