[openwrt/openwrt] wifi-scripts: wdev.uc: fix mesh mode frequency handling

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/7214acd7599a25863d6185a036d878b593b4b16c

commit 7214acd7599a25863d6185a036d878b593b4b16c
Author: Valent Turkovic <valent at meshpointone.com>
AuthorDate: Sat Jan 3 09:50:16 2026 +0100

    wifi-scripts: wdev.uc: fix mesh mode frequency handling
    
    Mesh mode interface creation fails when the freq parameter is empty or
    undefined. Unlike adhoc mode which checks if freq exists before using it,
    mesh mode blindly constructs the iw command with freq parameter, resulting
    in invalid syntax like:
    
      iw dev mesh0 mesh join ssid freq  NOHT
    
    This causes the mesh interface to be created without joining the mesh
    network, leaving it in a DOWN state with no channel assigned.
    
    Fix by adding freq validation check similar to adhoc mode.
    
    Tested on two routers in parallel as mesh peers:
    - Xiaomi AX3000T (MediaTek MT7981)
    - OpenWrt One (MediaTek MT7981)
    - OpenWrt 6.6.119, 802.11s mesh on 5GHz (Channel 36, HE80)
    
    Signed-off-by: Valent Turkovic <valent at meshpointone.com>
    Link: https://github.com/openwrt/openwrt/pull/21373
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 package/network/config/wifi-scripts/files/usr/share/hostap/wdev.uc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/package/network/config/wifi-scripts/files/usr/share/hostap/wdev.uc b/package/network/config/wifi-scripts/files/usr/share/hostap/wdev.uc
index 166e9403df..a4f9bf7b84 100644
--- a/package/network/config/wifi-scripts/files/usr/share/hostap/wdev.uc
+++ b/package/network/config/wifi-scripts/files/usr/share/hostap/wdev.uc
@@ -44,7 +44,12 @@ function iface_start(wdev)
 				push(cmd, key, wdev[key]);
 		system(cmd);
 	} else if (wdev.mode == "mesh") {
-		let cmd = [ "iw", "dev", ifname, "mesh", "join", wdev.ssid, "freq", wdev.freq, htmode ];
+		let cmd = [ "iw", "dev", ifname, "mesh", "join", wdev.ssid ];
+		if (wdev.freq) {
+			push(cmd, "freq", wdev.freq);
+			if (htmode && htmode != "NOHT")
+				push(cmd, htmode);
+		}
 		for (let key in [ "basic-rates", "mcast-rate", "beacon-interval" ])
 			if (wdev[key])
 				push(cmd, key, wdev[key]);