Arch Linux

Description:

Systemd uses some udev rules to rename network interfaces with deterministic names. For instance on my laptop, wlan0 is renamed wlp2s0.

When iwd is installed, the rename may or may not happen, depending on when iwd starts. Two cases here:
- iwd starts after rename, everything is fine
- iwd starts before the rename, rename fails with following error:

systemd-udevd[527]: wlan0: Failed to rename network interface 3 from 'wlan0' to 'wlp2s0': Device or resource busy

As a consequence, other services waiting for the specific wlp2s0 interface to show up may not be trigger (like systemd.network files). So we need to make sure iwd starts after the rename. My custom and local override for that is as follow:

/etc/systemd/system/iwd.service.d/override.conf :
-------------------------------------------------
[Unit]
BindsTo=sys-subsystem-net-devices-wlp2s0.device
After=sys-subsystem-net-devices-wlp2s0.device
-------------------------------------------------

That seems to solve the problem. This can easily be transformed into a generic solution using a iwd@.service and the %i placeholder, but I'm not sure this is the best possible fix.


Steps to reproduce:
- configure iwd service to start before systemd-udevd. This requires a reboot.