Signed-off-by: Dmitry Antipov <antipov@dev.rtsoft.ru>

--- .orig-2.6.23/fs/fcntl.c	2007-10-17 15:26:06.000000000 +0400
+++ 2.6.23/fs/fcntl.c	2007-10-17 15:25:27.000000000 +0400
@@ -240,6 +240,9 @@
 			error = filp->f_op->fasync(fd, filp, (arg & FASYNC) != 0);
 			if (error < 0)
 				goto out;
+		} else {
+			error = -EINVAL;
+			goto out;
 		}
 	}