From: Michael Brown <mcb30@etherboot.org>
Date: Tue, 9 Jan 2007 02:53:24 +0000 (+0000)
Subject: Avoid erasing non-existent signatures in undi_unload()
X-Git-Tag: v0.9.3~751
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ed44e3730d73d1ccc7aa045a57cd8d2b0a14eb47;p=thirdparty%2Fipxe.git

Avoid erasing non-existent signatures in undi_unload()
---

diff --git a/src/arch/i386/drivers/net/undiload.c b/src/arch/i386/drivers/net/undiload.c
index 7ae62480d..a0669d959 100644
--- a/src/arch/i386/drivers/net/undiload.c
+++ b/src/arch/i386/drivers/net/undiload.c
@@ -170,8 +170,10 @@ int undi_unload ( struct undi_device *undi ) {
 	DBGC ( undi, "UNDI %p unloading\n", undi );
 
 	/* Erase signatures */
-	put_real ( dead, undi->pxenv.segment, undi->pxenv.offset );
-	put_real ( dead, undi->ppxe.segment, undi->ppxe.offset );
+	if ( undi->pxenv.segment )
+		put_real ( dead, undi->pxenv.segment, undi->pxenv.offset );
+	if ( undi->ppxe_segment )
+		put_real ( dead, undi->ppxe.segment, undi->ppxe.offset );
 
 	/* Free base memory, if possible */
 	get_real ( fbms, BDA_SEG, BDA_FBMS );