From 8910aa92ae05e18a86516024d95d0691c9c55210 Mon Sep 17 00:00:00 2001
From: Paul Saab <ps@FreeBSD.org>
Date: Fri, 26 Aug 2005 01:00:19 +0000
Subject: [PATCH] For FreeBSD 4 binaries, when trying to read from a device
 that does not exsist, do not have ioctl return an error, but instead set -1
 in the data returned to the user.  This allows the HP bios flash utilities to
 work without requiring changes to their code.

Reviewed by:	jhb
---
 sys/dev/pci/pci_user.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/sys/dev/pci/pci_user.c b/sys/dev/pci/pci_user.c
index f2a7ed9fd7f0..6122ba576733 100644
--- a/sys/dev/pci/pci_user.c
+++ b/sys/dev/pci/pci_user.c
@@ -28,6 +28,7 @@
 __FBSDID("$FreeBSD$");
 
 #include "opt_bus.h"	/* XXX trim includes */
+#include "opt_compat.h"
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -411,7 +412,13 @@ getconfexit:
 							  io->pi_width);
 				error = 0;
 			} else {
-				error = ENODEV;
+#ifdef COMPAT_FREEBSD4
+				if (cmd == PCIOCREAD) {
+					io->pi_data = -1;
+					error = 0;
+				} else
+#endif
+					error = ENODEV;
 			}
 			break;
 		default: