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-rwxr-xr-xtools/testing/selftests/drivers/net/hw/ethtool_rmon.sh1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh b/tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh
index e2a1c10d3503..8f60c1685ad4 100755
--- a/tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh
+++ b/tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh
@@ -44,6 +44,7 @@ bucket_test()
# Mausezahn does not include FCS bytes in its length - but the
# histogram counters do
len=$((len - ETH_FCS_LEN))
+ len=$((len > 0 ? len : 0))
before=$(ethtool --json -S $iface --groups rmon | \
jq -r ".[0].rmon[\"${set}-pktsNtoM\"][$bucket].val")