diff --git a/target/linux/rockchip/armv8/base-files/etc/hotplug.d/net/40-net-smp-affinity b/target/linux/rockchip/armv8/base-files/etc/hotplug.d/net/40-net-smp-affinity
index 106a269b1b..bb119b9185 100644
--- a/target/linux/rockchip/armv8/base-files/etc/hotplug.d/net/40-net-smp-affinity
+++ b/target/linux/rockchip/armv8/base-files/etc/hotplug.d/net/40-net-smp-affinity
@@ -5,12 +5,13 @@
 get_device_irq() {
 	local device="$1"
 	local line
-	local seconds
+	local seconds="0"
 
 	# wait up to 10 seconds for the irq/device to appear
-	for seconds in $(seq 0 9); do
+	while [ "${seconds}" -le 10 ]; do
 		line=$(grep -m 1 "${device}\$" /proc/interrupts) && break
-		sleep 1
+		seconds="$(( seconds + 2 ))"
+		sleep 2
 	done
 	echo ${line} | sed 's/:.*//'
 }