[Bug 1585863] Re: WiFi malfunction after suspend & resume stress - sudo wpa_cli scan required to fix it.

[Olivier Tilloy]

For future reference, this is the list of upstream commits corresponding
to Aaron's patches, in the order they are being applied:

312cea870dfbc363da44074bd6f56ccd283c5420
  shared: add nm_auto_close and nm_auto_fclose

ed299cc8605a8291a61b3a514f8dc20390b18c77
  device/wwan: use nm_auto_close instead of gs_fd_close

713c74f6e4a88f874cf3e9908b3fb153f2ea5b83
  platform: add a new function nmp_utils_open_sysctl()

e714a20bc2464dc97492731a0d656e8c6bab65aa
  platform: refactor wifi_utils_is_wifi() not to pass sysfs_path

b95556eb781a18ee1c96470f40b9e1e162b0ee60
  platform: wifi: use nmp_utils_open_sysctl() to check if device is wifi

76876e896c242fd82d048743ffcf2c0481442dc5
  platform: refactor nmp_utils_sysctl_open_netdir()

4bdee37771ae741f4f9548b52c1db53ddf080fe8
  all: use O_CLOEXEC for file descriptors

dcc8de16b2acc43b2a9155fcfb91fa2602f3a401
  core: add utils for file handling


As far as I can tell, none of them have been backported to the 1.2 branch of NetworkManager.

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https://bugs.launchpad.net/bugs/1585863

Title:
  WiFi malfunction after suspend & resume stress - sudo wpa_cli scan
  required to fix it.

Status in OEM Priority Project:
  Fix Released
Status in OEM Priority Project xenial series:
  Fix Released
Status in network-manager package in Ubuntu:
  Fix Released

Bug description:
  HOW TO REPRODUCE:
  1. Install fwts by `sudo apt-get install fwts`.
  2. Run the suspend & resume stress test.
  sudo fwts s3 --s3-multiple=30 --s3-min-delay=5 --s3-max-delay=5 --s3-delay-delta=5

  RESULT:
  The WiFi can not connect to any access point and we have to execute `sudo wpa_cli scan` manually to make it work again.

  WORKAROUND:
  (http://askubuntu.com/questions/761180/wifi-doesnt-work-after-suspend-after-16-04-upgrade)

  SYSTEM INFO:
  Description:    Ubuntu Yakkety Yak (development branch)
  Release:        16.10
  Packages:
  libnm-glib-vpn1:amd64   1.2.2-0ubuntu2
  libnm-glib4:amd64       1.2.2-0ubuntu2
  libnm-util2:amd64       1.2.2-0ubuntu2
  libnm0:amd64    1.2.2-0ubuntu2
  network-manager 1.2.2-0ubuntu2

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