--- dahdi-linux-complete-2.6.1+2.6.1/linux/include/dahdi/kernel.h	2012-04-04 03:10:03.000000000 +0700
+++ dahdi-linux-complete/linux/include/dahdi/kernel.h	2012-11-27 18:02:44.666208494 +0700
@@ -1091,6 +1091,12 @@
 	int master;
 	unsigned char *msgbuf;
 	struct device *dev;
+	struct kfifo *rxfifo;
+	int rxfifo_size;        /* Not aligned size of FIFO, we actually use */
+	spinlock_t rxfifo_lock; /* See connent below (spin_lock_init) */
+	unsigned int slip;
+	unsigned int skip;
+	unsigned int rxnuerr;
 
 	struct list_head list;
 };