From: Michael Brown <mcb30@etherboot.org>
Date: Sun, 28 Jun 2009 19:12:16 +0000 (+0100)
Subject: [pxe] Check for unhookable interrupts in PXENV_STOP_UNDI
X-Git-Tag: v0.9.8~99
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ee1d315ac06d6fa0dcc95cbd54ee264e838d1b6b;p=thirdparty%2Fipxe.git

[pxe] Check for unhookable interrupts in PXENV_STOP_UNDI

PXENV_STOP_UNDI should return PXENV_STATUS_KEEP_UNDI if the UNDI
cannot be safely unloaded (e.g. due to interrupt vectors that could
not be unhooked).
---

diff --git a/src/arch/i386/interface/pxe/pxe_preboot.c b/src/arch/i386/interface/pxe/pxe_preboot.c
index 21461a5ab..3939c7bf5 100644
--- a/src/arch/i386/interface/pxe/pxe_preboot.c
+++ b/src/arch/i386/interface/pxe/pxe_preboot.c
@@ -37,6 +37,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #include <gpxe/init.h>
 #include <gpxe/if_ether.h>
 #include <basemem_packet.h>
+#include <biosint.h>
 #include "pxe.h"
 #include "pxe_call.h"
 
@@ -316,6 +317,14 @@ PXENV_EXIT_t pxenv_stop_undi ( struct s_PXENV_STOP_UNDI *stop_undi ) {
 	/* Prepare for unload */
 	shutdown ( SHUTDOWN_BOOT );
 
+	/* Check to see if we still have any hooked interrupts */
+	if ( hooked_bios_interrupts != 0 ) {
+		DBG ( "PXENV_STOP_UNDI failed: %d interrupts still hooked\n",
+		      hooked_bios_interrupts );
+		stop_undi->Status = PXENV_STATUS_KEEP_UNDI;
+		return PXENV_EXIT_FAILURE;
+	}
+
 	stop_undi->Status = PXENV_STATUS_SUCCESS;
 	return PXENV_EXIT_SUCCESS;
 }