From d3fd38637febad007bcc692bd79d5af08a17689d Mon Sep 17 00:00:00 2001
From: Mathias Kresin <dev@kresin.me>
Date: Sat, 6 Jan 2018 17:30:38 +0100
Subject: lantiq: create ATM/PTM interfaces with dsl as netdev name

Renaming an atm etherbride using 'ip link' (via hotplug) is racy since the
original netdev might disappear before br2684ctl has finished appling it's
setting:

 local2.notice br2684ctl[1667]: Interface "nas0" created sucessfully
 local2.notice br2684ctl[1667]: Communicating over ATM 0.8.35, encapsulation: LLC
 kern.info kernel: dsl0: renamed from nas0
 kern.err kernel: br2684:br2684_regvcc: tried to attach to non-existent device
 local2.err br2684ctl[1667]: Could not configure interface:No such device or address

By passing the final used netdev name to br2684ctl_wrap another race
condition workaround will be enabled again.

Change the lantiq ptm driver to create a netdev with the name dsl as well.
Albeit the rename via 'ip link' works fine so far, using a different
approach for ptm then atm could be confusing.

Signed-off-by: Mathias Kresin <dev@kresin.me>
---
 target/linux/lantiq/base-files/etc/board.d/02_network        |  2 +-
 .../lantiq/base-files/etc/uci-defaults/02_migrate_xdsl_iface | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

(limited to 'target')

diff --git a/target/linux/lantiq/base-files/etc/board.d/02_network b/target/linux/lantiq/base-files/etc/board.d/02_network
index efe631c99e..ca974b071e 100755
--- a/target/linux/lantiq/base-files/etc/board.d/02_network
+++ b/target/linux/lantiq/base-files/etc/board.d/02_network
@@ -229,7 +229,7 @@ buffalo,wbmr-300hpd)
 esac
 
 ls /lib/modules/$(uname -r)/ltq_atm* 1> /dev/null 2>&1 && \
-	ucidef_add_atm_bridge "$vpi" "$vci" "$encaps" "$payload"
+	ucidef_add_atm_bridge "$vpi" "$vci" "$encaps" "$payload" "dsl"
 
 if lantiq_is_vdsl_system; then
 	ucidef_add_vdsl_modem "$annex" "$tone" "$xfer_mode"
diff --git a/target/linux/lantiq/base-files/etc/uci-defaults/02_migrate_xdsl_iface b/target/linux/lantiq/base-files/etc/uci-defaults/02_migrate_xdsl_iface
index 292d407c30..3b0313d1aa 100644
--- a/target/linux/lantiq/base-files/etc/uci-defaults/02_migrate_xdsl_iface
+++ b/target/linux/lantiq/base-files/etc/uci-defaults/02_migrate_xdsl_iface
@@ -29,6 +29,17 @@ rename_xdsl_ifname()
 	IFNAME_CHANGED=1
 }
 
+add_atm_bridge_nameprefix()
+{
+	local cfg="$1"
+
+	config_get nameprefix "$cfg" nameprefix
+	[ -z "$nameprefix" ] || return
+
+	uci set network.${cfg}.nameprefix="dsl"
+	IFNAME_CHANGED=1
+}
+
 migrate_network_xdsl_ifname()
 {
 	rename_xdsl_ifname network "$1" ifname
@@ -42,6 +53,7 @@ migrate_led_xdsl_ifname()
 
 config_load network
 config_foreach migrate_network_xdsl_ifname
+config_foreach add_atm_bridge_nameprefix atm-bridge
 
 [ "$IFNAME_CHANGED" = "1" ] && uci commit network
 
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