From: Ronny Kotzschmar <ro.ok@me.com>
Date: Wed, 6 Jul 2022 13:14:21 +0000 (+0200)
Subject: rockchip: reliably distribute net interrupts
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=9b00e9795660f53caf1f4f5fd932bbbebd2eeeb1;p=openwrt%2Fstaging%2Fsvanheule.git

rockchip: reliably distribute net interrupts

On the NanoPI R4S it takes an average of 3..5 seconds for the network devices
to appear in '/proc/interrupts'.
Wait up to 10 seconds to ensure that the distribution of the interrupts
really happens.

Signed-off-by: Ronny Kotzschmar <ro.ok@me.com>
---

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 9e4a4cf4fc..c76e62a23a 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
@@ -4,8 +4,15 @@
 
 get_device_irq() {
 	local device="$1"
-
-	local line=$(grep -m 1 "${device}\$" /proc/interrupts)
+	local line
+	local seconds="0"
+
+	# wait up to 10 seconds for the irq/device to appear
+	while [ "${seconds}" -le 10 ]; do
+		line=$(grep -m 1 "${device}\$" /proc/interrupts) && break
+		seconds="$(( seconds + 2 ))"
+		sleep 2
+	done
 	echo ${line} | sed 's/:.*//'
 }