selftests: net: lib: support errexit with busywait

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From: Matthieu Baerts (NGI0) <matttbe@xxxxxxxxxx>

commit 41b02ea4c0adfcc6761fbfed42c3ce6b6412d881 upstream.

If errexit is enabled ('set -e'), loopy_wait -- or busywait and others
using it -- will stop after the first failure.

Note that if the returned status of loopy_wait is checked, and even if
errexit is enabled, Bash will not stop at the first error.

Fixes: 25ae948b4478 ("selftests/net: add lib.sh")
Cc: stable@xxxxxxxxxxxxxxx
Acked-by: Geliang Tang <geliang@xxxxxxxxxx>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@xxxxxxxxxx>
Reviewed-by: Hangbin Liu <liuhangbin@xxxxxxxxx>
Link: https://lore.kernel.org/r/20240605-upstream-net-20240605-selftests-net-lib-fixes-v1-1-b3afadd368c9@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 tools/testing/selftests/net/lib.sh |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/tools/testing/selftests/net/lib.sh
+++ b/tools/testing/selftests/net/lib.sh
@@ -63,9 +63,7 @@ loopy_wait()
 	while true
 	do
 		local out
-		out=$("$@")
-		local ret=$?
-		if ((!ret)); then
+		if out=$("$@"); then
 			echo -n "$out"
 			return 0
 		fi


Patches currently in stable-queue which might be from matttbe@xxxxxxxxxx are

queue-6.9/selftests-net-lib-support-errexit-with-busywait.patch
queue-6.9/selftests-net-lib-avoid-error-removing-empty-netns-name.patch




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