diff --git a/include/linux/libata.h b/include/linux/libata.h
index 7e13eb4..50d7cb1 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -762,6 +762,7 @@
 	unsigned long		qc_allocated;
 	unsigned int		qc_active;
 	int			nr_active_links; /* #links with active qcs */
+	unsigned int		last_tag;	/* track next tag hw expects */
 
 	struct ata_link		link;		/* host default link */
 	struct ata_link		*slave_link;	/* see ata_slave_link_init() */