grep|cut pipe will hang when there is no input for grep

Signed-off-by: Lu Dai dai.lu@exordes.com --- tools/testing/selftests/kselftest_deps.sh | 1 + 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/kselftest_deps.sh b/tools/testing/selftests/kselftest_deps.sh index de59cc8f03c3..487e49fdf2a6 100755 --- a/tools/testing/selftests/kselftest_deps.sh +++ b/tools/testing/selftests/kselftest_deps.sh @@ -244,6 +244,7 @@ l4_test() l5_test() { tests=$(find $(dirname "$test") -type f -name "*.mk") + [[ -z "${tests// }" ]] && return test_libs=$(grep "^IOURING_EXTRA_LIBS +?=" $tests | \ cut -d "=" -f 2)