Opened 8 years ago

Closed 8 years ago

#419 closed defect (fixed)

Udev does not ifup wireless interface

Reported by: nicola.mfb@… Owned by: ainulindale
Priority: major Milestone:
Component: SHR Image Version: SHR-testing
Keywords: Cc:


When enabling wifi udev launches /etc/udev/scripts/, but eth0 is alread up and not configured, so it skips and does not ifup eth0.

This was reported on

It was proposed to use connman, but as it does not support wpa/wpa2 enterprise networks while a plain wpa_supplicant does, this should really be fixed.

Change History (2)

comment:1 Changed 8 years ago by nicola.mfb@…

I forgot to mention that this is only the "starting point" for a quite completely broken userspace default wpa_supplicant support.

Applying the proposed patch eth0 is handled by udev but when disabling it wpa_supplicant will not die causing some strange problems when the interface comes up again.

As wpa_supplicant may takes time to associate on complex/distant networks udhcpc may fail, it should be launched *after* wpa_supplicant associated, and respawned every time it associate/deassociate (eg. network changed, freerunner out of range for a long time, etc.)

This should be the default, but it seems that in the OE/debian world this may be achieved by wpa-roaming mode, well this is broken too (missing wpa_action?), and it seems in the past it worked as reported on

Actually as a workaround I hacked /etc/udev/scripts/ and:
*) when eth0 comes up it launches wpa_supplicant with -W (wait for wpa_cli)
*) and launches wpa_cli -a /etc/wpa_supplicant/
*) when eth0 comes down, it kills udhcpc and the two above daemons.

Udhcpc is *not* spawned by udev, when wpa_supplicant associate, wpa_cli gets notified and launches /etc/wpa_supplicant/ that spawns finally udhcpc, so no more timeout.
After that enabling/disabling the wifi resource works quite perfectly.



comment:2 Changed 8 years ago by TAsn

  • Resolution set to fixed
  • Status changed from new to closed

We moved to connman as suggested.

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