From 14eafc5b8de58c4495087cddfefe89e03ccda70c Mon Sep 17 00:00:00 2001
From: Michael Brown
Date: Tue, 17 Feb 2009 01:45:12 +0000
Subject: [comboot] Fix reference counting on replacement images

When chaining COMBOOT images, the old images now get freed correctly.
---
 src/include/gpxe/image.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'src/include')

diff --git a/src/include/gpxe/image.h b/src/include/gpxe/image.h
index 0163b0824..f8b1482ee 100644
--- a/src/include/gpxe/image.h
+++ b/src/include/gpxe/image.h
@@ -53,7 +53,12 @@ struct image {
 	 * style similar to a Unix exec() call) should return from its
 	 * exec() method with the replacement image set to point to
 	 * the new image.  The new image must already be in a suitable
-	 * state for execution.
+	 * state for execution (i.e. loaded).
+	 *
+	 * If an image unregisters itself as a result of being
+	 * executed, it must make sure that its replacement image (if
+	 * any) is registered, otherwise the replacement is likely to
+	 * be freed before it can be executed.
 	 */
 	struct image *replacement;
 };
-- 
cgit v1.2.3-55-g7522