[Bug 1672740] Re: Netplan replug function is incompatible with ath9k_htc module

[Mathieu Trudel-Lapierre]

nplan (0.21) artful; urgency=medium

  [ Ryan Harper ]
  * Add support for setting MTU on a device. (LP: #1668693)

  [ Mathieu Trudel-Lapierre ]
  * Don't rebind Atheros AR9271; it would confuse the driver. (LP: #1672740)
  * debian/control: Add Conflicts: against netplan; the network 'plan' daemon.
    Both ship the same /usr/sbin/netplan. (LP: #1665842)


** Also affects: nplan (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: netplan
       Status: Fix Committed => Fix Released

** Changed in: nplan (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1672740

Title:
  Netplan replug function is incompatible with ath9k_htc module

Status in netplan:
  Fix Released
Status in nplan package in Ubuntu:
  Fix Released

Bug description:
  We hit the following problem about the interaction  between netplan
  and the ath9k_htc module, controlling the chip Atheros AR9271.

  If you run the following command

      netplan --debug apply

  or  you use console-conf for setting the network interfaces we get the
  following messages :

  ** (generate:2261): DEBUG: Processing input file //etc/netplan/00-snapd-config.yaml..
  ** (generate:2261): DEBUG: eth0: setting default backend to 1
  ** (generate:2261): DEBUG: Generating output files..
  ** (generate:2261): DEBUG: NetworkManager: definition eth0 is not for us (backend 1)
  DEBUG:netplan generated networkd configuration exists, restarting networkd
  DEBUG:no netplan generated NM configuration exists
  DEBUG:device lo operstate is unknown, not replugging
  DEBUG:device eth0 operstate is up, not replugging
  DEBUG:replug wlan0: unbinding 4-1:1.0 from /sys/bus/usb/drivers/ath9k_htc
  DEBUG:replug wlan0: rebinding 4-1:1.0 to /sys/bus/usb/drivers/ath9k_htc

  The last two row show two consecutive actions, one soon after the
  other:  unbind and bind the usb device on usb hub.

  The module ath9k_htc doesn't work fine in this situation: the wireless
  interface disappears.

  Our problem can be fixed by using the same approach used for mac80211_hwsim e mwifiex_pcie modules. 
  The attached patch file fix the issue following the same pattern adopted for the following modules:
  mwifiex_pcie,mac80211_hwsim.

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