From 2a30aab6f46a414a481dbc59d113e1f7bf2b3d48 Mon Sep 17 00:00:00 2001
From: Ingo Weinhold <ingo_weinhold@gmx.de>
Date: Fri, 8 Jan 2010 20:39:08 +0000
Subject: [PATCH] Don't announce page access before being sure that the page
 isn't busy. Fixes the erroneously trigger panic() in #5216.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34958 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 src/system/kernel/vm/vm_page.cpp | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/system/kernel/vm/vm_page.cpp b/src/system/kernel/vm/vm_page.cpp
index 9d3f59de59..0c087f54df 100644
--- a/src/system/kernel/vm/vm_page.cpp
+++ b/src/system/kernel/vm/vm_page.cpp
@@ -1659,17 +1659,16 @@ vm_page_write_modified_page_range(struct VMCache* cache, uint32 firstPage,
 
 		bool dequeuedPage = false;
 		if (page != NULL) {
-			DEBUG_PAGE_ACCESS_START(page);
-
 			if (page->state == PAGE_STATE_MODIFIED) {
+				DEBUG_PAGE_ACCESS_START(page);
 				AutoLocker<VMPageQueue> locker(sModifiedPageQueue);
 				sModifiedPageQueue.Remove(page);
 				dequeuedPage = true;
 			} else if (page->state == PAGE_STATE_BUSY
 					|| !vm_test_map_modification(page)) {
-				DEBUG_PAGE_ACCESS_END(page);
 				page = NULL;
-			}
+			} else
+				DEBUG_PAGE_ACCESS_START(page);
 		}
 
 		PageWriteWrapper* wrapper = NULL;