If run on the ethtool_rmon.sh script, shellcheck generates a bunch of
false positive errors. Suppress those checks that generate them.

Also cleanup the remaining warnings by using double quoting around the
used variables.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
---
Changes in v5:
- none
Changes in v4:
- split one line to 80 chars
Changes in v3:
- none
Changes in v2:
- patch is new

 .../selftests/drivers/net/hw/ethtool_rmon.sh  | 54 ++++++++++---------
 1 file changed, 29 insertions(+), 25 deletions(-)

diff --git a/tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh b/tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh
index 8f60c1685ad4..13b3760e3a40 100755
--- a/tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh
+++ b/tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
+#shellcheck disable=SC2034 # SC does not see the global variables
+#shellcheck disable=SC2317,SC2329 # unused functions
 
 ALL_TESTS="
 	rmon_rx_histogram
@@ -19,11 +21,12 @@ ensure_mtu()
 {
 	local iface=$1; shift
 	local len=$1; shift
-	local current=$(ip -j link show dev $iface | jq -r '.[0].mtu')
 	local required=$((len - ETH_HLEN - ETH_FCS_LEN))
+	local current
 
-	if [ $current -lt $required ]; then
-		ip link set dev $iface mtu $required || return 1
+	current=$(ip -j link show dev "$iface" | jq -r '.[0].mtu')
+	if [ "$current" -lt "$required" ]; then
+		ip link set dev "$iface" mtu "$required" || return 1
 	fi
 }
 
@@ -46,23 +49,23 @@ bucket_test()
 	len=$((len - ETH_FCS_LEN))
 	len=$((len > 0 ? len : 0))
 
-	before=$(ethtool --json -S $iface --groups rmon | \
+	before=$(ethtool --json -S "$iface" --groups rmon | \
 		jq -r ".[0].rmon[\"${set}-pktsNtoM\"][$bucket].val")
 
 	# Send 10k one way and 20k in the other, to detect counters
 	# mapped to the wrong direction
-	$MZ $neigh -q -c $num_rx -p $len -a own -b bcast -d 10us
-	$MZ $iface -q -c $num_tx -p $len -a own -b bcast -d 10us
+	"$MZ" "$neigh" -q -c "$num_rx" -p "$len" -a own -b bcast -d 10us
+	"$MZ" "$iface" -q -c "$num_tx" -p "$len" -a own -b bcast -d 10us
 
-	after=$(ethtool --json -S $iface --groups rmon | \
+	after=$(ethtool --json -S "$iface" --groups rmon | \
 		jq -r ".[0].rmon[\"${set}-pktsNtoM\"][$bucket].val")
 
 	delta=$((after - before))
 
-	expected=$([ $set = rx ] && echo $num_rx || echo $num_tx)
+	expected=$([ "$set" = rx ] && echo "$num_rx" || echo "$num_tx")
 
 	# Allow some extra tolerance for other packets sent by the stack
-	[ $delta -ge $expected ] && [ $delta -le $((expected + 100)) ]
+	[ "$delta" -ge "$expected" ] && [ "$delta" -le $((expected + 100)) ]
 }
 
 rmon_histogram()
@@ -78,23 +81,23 @@ rmon_histogram()
 	while read -r -a bucket; do
 		step="$set-pkts${bucket[0]}to${bucket[1]} on $iface"
 
-		for if in $iface $neigh; do
-			if ! ensure_mtu $if ${bucket[0]}; then
+		for if in "$iface" "$neigh"; do
+			if ! ensure_mtu "$if" "${bucket[0]}"; then
 				log_test_xfail "$if does not support the required MTU for $step"
 				return
 			fi
 		done
 
-		if ! bucket_test $iface $neigh $set $nbuckets ${bucket[0]}; then
+		if ! bucket_test "$iface" "$neigh" "$set" "$nbuckets" "${bucket[0]}"; then
 			check_err 1 "$step failed"
 			return 1
 		fi
 		log_test "$step"
 		nbuckets=$((nbuckets + 1))
-	done < <(ethtool --json -S $iface --groups rmon | \
+	done < <(ethtool --json -S "$iface" --groups rmon | \
 		jq -r ".[0].rmon[\"${set}-pktsNtoM\"][]|[.low, .high]|@tsv" 2>/dev/null)
 
-	if [ $nbuckets -eq 0 ]; then
+	if [ "$nbuckets" -eq 0 ]; then
 		log_test_xfail "$iface does not support $set histogram counters"
 		return
 	fi
@@ -102,14 +105,14 @@ rmon_histogram()
 
 rmon_rx_histogram()
 {
-	rmon_histogram $h1 $h2 rx
-	rmon_histogram $h2 $h1 rx
+	rmon_histogram "$h1" "$h2" rx
+	rmon_histogram "$h2" "$h1" rx
 }
 
 rmon_tx_histogram()
 {
-	rmon_histogram $h1 $h2 tx
-	rmon_histogram $h2 $h1 tx
+	rmon_histogram "$h1" "$h2" tx
+	rmon_histogram "$h2" "$h1" tx
 }
 
 setup_prepare()
@@ -117,9 +120,10 @@ setup_prepare()
 	h1=${NETIFS[p1]}
 	h2=${NETIFS[p2]}
 
-	for iface in $h1 $h2; do
-		netif_mtu[$iface]=$(ip -j link show dev $iface | jq -r '.[0].mtu')
-		ip link set dev $iface up
+	for iface in "$h1" "$h2"; do
+		netif_mtu["$iface"]=$(ip -j link show dev "$iface" | \
+			jq -r '.[0].mtu')
+		ip link set dev "$iface" up
 	done
 }
 
@@ -127,9 +131,9 @@ cleanup()
 {
 	pre_cleanup
 
-	for iface in $h2 $h1; do
-		ip link set dev $iface \
-			mtu ${netif_mtu[$iface]} \
+	for iface in "$h2" "$h1"; do
+		ip link set dev "$iface" \
+			mtu "${netif_mtu[$iface]}" \
 			down
 	done
 }
@@ -142,4 +146,4 @@ setup_wait
 
 tests_run
 
-exit $EXIT_STATUS
+exit "$EXIT_STATUS"
-- 
2.25.1