From 9cf721279f6cb0dec09c8752e471f15fb662406b Mon Sep 17 00:00:00 2001
From: Petr Tesarik <ptesarik@suse.com>
Date: Fri, 13 Mar 2020 15:09:29 +0100
Subject: [PATCH] kexec-tools: Reset getopt before falling back to legacy
 syscall

The modules may need to parse the arguments again after
kexec_file_load(2) failed, but getopt is not reset.

This change fixes the --initrd option on s390x. Without this patch,
it will fail to load the initrd on kernels that do not implement
kexec_file_load(2).

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

diff --git a/kexec/kexec.c b/kexec/kexec.c
index 33c1b4b..6601f1f 100644
--- a/kexec/kexec.c
+++ b/kexec/kexec.c
@@ -1538,8 +1538,12 @@ int main(int argc, char *argv[])
 	if (do_unload) {
 		if (do_kexec_file_syscall) {
 			result = kexec_file_unload(kexec_file_flags);
-			if (result == EFALLBACK && do_kexec_fallback)
+			if (result == EFALLBACK && do_kexec_fallback) {
+				/* Reset getopt for fallback */
+				opterr = 1;
+				optind = 1;
 				do_kexec_file_syscall = 0;
+			}
 		}
 		if (!do_kexec_file_syscall)
 			result = k_unload(kexec_flags);
@@ -1548,8 +1552,12 @@ int main(int argc, char *argv[])
 		if (do_kexec_file_syscall) {
 			result = do_kexec_file_load(fileind, argc, argv,
 						 kexec_file_flags);
-			if (result == EFALLBACK && do_kexec_fallback)
+			if (result == EFALLBACK && do_kexec_fallback) {
+				/* Reset getopt for fallback */
+				opterr = 1;
+				optind = 1;
 				do_kexec_file_syscall = 0;
+			}
 		}
 		if (!do_kexec_file_syscall)
 			result = my_load(type, fileind, argc, argv,
-- 
1.8.3.1