[PATCH] Avoid unnecessary ide-cd cache flushes

Only issue a cdrom cache flush if we've done write to the drive.  The
->media_written() flag keeps track of that.
Signed-off-by: NJens Axboe <axboe@suse.de>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/cdrom/cdrom.c

@@ -645,7 +645,7 @@ static int cdrom_mrw_exit(struct cdrom_device_info *cdi)
 		ret = cdrom_mrw_bgformat_susp(cdi, 0);
 	}
 
-	if (!ret)
+	if (!ret && cdi->media_written)
 		ret = cdrom_flush_cache(cdi);
 
 	return ret;