From: David Bauer <mail@david-bauer.net>
Date: Sat, 18 Jun 2022 02:37:56 +0200
Subject: ramips: add MT7621 WiFi devpath migration

Add a migration script to migrate the device path of PCIe WiFi hardware
from OpenWrt 19.07 to the one used with OpenWrt 21.02+.

Signed-off-by: David Bauer <mail@david-bauer.net>

diff --git a/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/00-wifi-migration b/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/00-wifi-migration
new file mode 100644
index 0000000000000000000000000000000000000000..17fd4a58ff2d56694743e149292746c136b6f27a
--- /dev/null
+++ b/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/00-wifi-migration
@@ -0,0 +1,38 @@
+#!/bin/sh
+
+# Migrate WiFi path from 19.07 to 21.02+
+
+WIFI_PATH_CHANGED=0
+
+. /lib/functions.sh
+
+migrate_wifi_path() {
+	local section="$1"
+	local path
+
+	config_get path ${section} path
+	case ${path} in
+		"pci0000:00/0000:00:00.0/0000:01:00.0")
+			path="1e140000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0"
+			WIFI_PATH_CHANGED=1
+		;;
+		"pci0000:00/0000:00:01.0/0000:02:00.0")
+			path="1e140000.pcie/pci0000:00/0000:00:01.0/0000:02:00.0"
+			WIFI_PATH_CHANGED=1
+		;;
+		*)
+			return 0
+		;;
+	esac
+
+	uci set wireless.${section}.path=${path}
+}
+
+[ "${ACTION}" = "add" ] && {
+	[ ! -e /etc/config/wireless ] && return 0
+
+	config_load wireless
+	config_foreach migrate_wifi_path wifi-device
+
+	[ "${WIFI_PATH_CHANGED}" = "1" ] && uci commit wireless
+}