diff -dwup3 -X excl.txt -r \dev\openib\ofw\gen1\branches\mlx4_30\trunk\hw\mlx4\user\hca\qp.c .\hw\mlx4\user\hca\qp.c
--- \dev\openib\ofw\gen1\branches\mlx4_30\trunk\hw\mlx4\user\hca\qp.c	Tue Aug 07 17:06:08 2012
+++ .\hw\mlx4\user\hca\qp.c	Fri Aug 10 15:22:02 2012
@@ -755,6 +755,10 @@ void mlx4_clear_qp(struct mlx4_context *
 {
 	int tind = (qpn & (ctx->num_qps - 1)) >> ctx->qp_table_shift;
 
+    if (ctx->qp_table[tind].table == NULL) {
+        return;
+    }
+
 	pthread_mutex_lock(&ctx->qp_table_mutex);
 
 	if (!--ctx->qp_table[tind].refcnt)