Index: hw/mlx4/user/hca/mlx4.c
===================================================================
--- hw/mlx4/user/hca/mlx4.c	(revision 1521)
+++ hw/mlx4/user/hca/mlx4.c	(working copy)
@@ -78,10 +78,6 @@
 	if (!context->db_list_mutex)
 		goto err_db_mutex;
 
-	context->ibv_ctx.mutex = CreateMutex(NULL, FALSE, NULL);
-	if (!context->ibv_ctx.mutex)
-		goto err_ctx_mutex;
-
 	if (cl_spinlock_init(&context->uar_lock))
 		goto err_uar_spinlock;
 
@@ -93,8 +89,6 @@
 err_bf_spinlock:
 	cl_spinlock_destroy(&context->uar_lock);
 err_uar_spinlock:
-	CloseHandle(context->ibv_ctx.mutex);
-err_ctx_mutex:
 	CloseHandle(context->db_list_mutex);
 err_db_mutex:
 #ifdef XRC_SUPPORT
@@ -168,7 +162,6 @@
 
 	cl_spinlock_destroy(&context->bf_lock);
 	cl_spinlock_destroy(&context->uar_lock);
-	CloseHandle(context->ibv_ctx.mutex);
 	CloseHandle(context->db_list_mutex);
 #ifdef XRC_SUPPORT
 	CloseHandle(context->xrc_srq_table_mutex);
Index: hw/mlx4/user/hca/verbs.h
===================================================================
--- hw/mlx4/user/hca/verbs.h	(revision 1521)
+++ hw/mlx4/user/hca/verbs.h	(working copy)
@@ -210,7 +210,6 @@
 
 struct ibv_context {
 	int				page_size;
-	pthread_mutex_t	mutex;
 };