File grub-0.97-bz670266-find-active-pxe-handle.patch of Package grub

From 392d5385f0c4b8e9b1654b4395b07991caffb415 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Tue, 14 Feb 2012 13:53:13 -0500
Subject: [PATCH] Iterate PXE handles until we find one that's got a dhcp ack.

I seriously don't know why EfiLocateProtocol() exists.  It is basically
always wrong to use. So instead, use EfiLocateHandle() to get a list of
handles supporting PxeBaseCodeProtocol, and then iterate them until we
find one that claims it's actually got a dhcp ack.

Resolves: rhbz#670266 .
---
 efi/pxe.c |   20 ++++++++++++++++----
 1 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/efi/pxe.c b/efi/pxe.c
index 1a74315..d3084a4 100644
--- a/efi/pxe.c
+++ b/efi/pxe.c
@@ -346,11 +346,27 @@ char *grub_efi_pxe_get_config_path(grub_efi_loaded_image_t *LoadedImage)
 	char hexip[9];
 	int hexiplen;
 
-	pxe = grub_efi_locate_protocol(&PxeBaseCodeProtocol, NULL);
-	if (pxe == NULL)
-		return NULL;
+	grub_efi_handle_t *handle, *handles;
+	grub_efi_uintn_t num_handles;
+
+	handles = grub_efi_locate_handle(GRUB_EFI_BY_PROTOCOL,
+					&PxeBaseCodeProtocol,
+					NULL, &num_handles);
+
+	if (!handles)
+		return NULL;
+
+	for (handle = handles; num_handles--; handle++) {
+		pxe = grub_efi_open_protocol(*handle, &PxeBaseCodeProtocol,
+			GRUB_EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+		if (!pxe || !pxe->Mode)
+			continue;
+		if (pxe->Mode->Started && pxe->Mode->DhcpAckReceived)
+			break;
+	}
+	grub_free(handles);
 
-	if (!pxe->Mode->Started)
+	if (!pxe)
 		return NULL;
 
 	set_pxe_info(LoadedImage, pxe);
-- 
1.7.7.6