From: Quentin Monnet <quentin.monnet@netronome.com>
Date: Thu, 19 Oct 2017 15:46:20 -0700
Subject: tools: bpftool: fix return value when all eBPF programs have been
 shown
Patch-mainline: v4.15-rc1
Git-commit: 1739c26da72c4170c86c368c75133adbb740efef
References: bsc#1109837

Change the program to have a more consistent return code. Specifically,
do not make bpftool return an error code simply because it reaches the
end of the list of the eBPF programs to show.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 tools/bpf/bpftool/prog.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -275,8 +275,10 @@ static int do_show(int argc, char **argv
 	while (true) {
 		err = bpf_prog_get_next_id(id, &id);
 		if (err) {
-			if (errno == ENOENT)
+			if (errno == ENOENT) {
+				err = 0;
 				break;
+			}
 			err("can't get next program: %s\n", strerror(errno));
 			if (errno == EINVAL)
 				err("kernel too old?\n");