1 files changed, 31 insertions, 0 deletions

diff --git a/tools/testing/selftests/firmware/fw_fallback.sh b/tools/testing/selftests/firmware/fw_fallback.sh
index 2e4c22d5abf7..8f511035f783 100755
--- a/tools/testing/selftests/firmware/fw_fallback.sh
+++ b/tools/testing/selftests/firmware/fw_fallback.sh
@@ -134,6 +134,27 @@ load_fw_custom_cancel()
         wait
 }
 
+load_fw_fallback_with_child()
+{
+        local name="$1"
+        local file="$2"
+
+        # This is the value already set but we want to be explicit
+        echo 4 >/sys/class/firmware/timeout
+
+        sleep 1 &
+        SECONDS_BEFORE=$(date +%s)
+        echo -n "$name" >"$DIR"/trigger_request 2>/dev/null
+        SECONDS_AFTER=$(date +%s)
+        SECONDS_DELTA=$(($SECONDS_AFTER - $SECONDS_BEFORE))
+        if [ "$SECONDS_DELTA" -lt 4 ]; then
+                RET=1
+        else
+                RET=0
+        fi
+        wait
+        return $RET
+}
 
 trap "test_finish" EXIT
 
@@ -221,4 +242,14 @@ else
         echo "$0: cancelling custom fallback mechanism works"
 fi
 
+set +e
+load_fw_fallback_with_child "nope-signal-$NAME" "$FW"
+if [ "$?" -eq 0 ]; then
+        echo "$0: SIGCHLD on sync ignored as expected" >&2
+else
+        echo "$0: error - sync firmware request cancelled due to SIGCHLD" >&2
+        exit 1
+fi
+set -e
+
 exit 0