--- a/usr/src/uts/common/fs/zfs/zfs_ioctl.c	Mon Feb 12 15:22:44 2007 -0800
+++ b/usr/src/uts/common/fs/zfs/zfs_ioctl.c	Mon Feb 12 17:35:21 2007 -0800
@@ -1617,8 +1617,8 @@
 	NULL,		/* streamtab */
 	D_NEW | D_MP | D_64BIT,		/* Driver compatibility flag */
 	CB_REV,		/* version */
-	zvol_aread,	/* async read */
-	zvol_awrite,	/* async write */
+	nodev,		/* async read */
+	nodev,		/* async write */
 };
 
 static struct dev_ops zfs_dev_ops = {