APPLIED [OEM-5.10] Re: [SRU] [H/OEM-5.10] [PATCH 0/3] Handle Intel Wifi firmware disconnection

[Timo Aaltonen]

On 1.4.2021 8.01, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1922171
> 
> [Impact]
> Intel Wifi firmware may crash when it's connected to B/G wireless.
> 
> [Fix]
> There's a new "feature" that when firmware thinks there are too much
> noise in the current frequency, it will automatically disconnect
> wifi and expect software/OS to change channel/frequency and reconnect.
> Otherwise, firmware crashes.
> 
> [Test]
> [ 2651.943142] wlp0s20f3: associate with 00:24:a5:b5:f8:93 (try 1/3)
> [ 2651.951043] wlp0s20f3: RX AssocResp from 00:24:a5:b5:f8:93 (capab=0x421 status=0 aid=1)
> [ 2651.962960] wlp0s20f3: associated
> [ 2651.966183] IPv6: ADDRCONF(NETDEV_CHANGE): wlp0s20f3: link becomes ready
> [ 2651.972582] wlp0s20f3: Driver requested disconnection from AP 00:24:a5:b5:f8:93
> [ 2654.641627] wlp0s20f3: authenticate with 00:24:a5:b5:f8:93
> 
> Now it's "Driver requested disconnection" instead of firmware crash.
> 
> [Where problems could occur]
> The first two patches on 80211 only provide new hook and don't bring any
> functional change.
> 
> The third patch achieves the "feature" by removing cap
> IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_IN_2G. I am no expert on
> 80211, but if there's any AP that doesn't support 20MHZ for 2.4G, the
> reconnecting may fail.
> 
> Johannes Berg (3):
>    cfg80211: support immediate reconnect request hint
>    mac80211: support driver-based disconnect with reconnect hint
>    iwlwifi: mvm: handle CCA-EXT delay firmware notification
> 
>   .../wireless/intel/iwlwifi/fw/api/datapath.h  | 86 +++++--------------
>   .../net/wireless/intel/iwlwifi/mvm/mac80211.c | 39 +++++++++
>   drivers/net/wireless/intel/iwlwifi/mvm/mvm.h  |  3 +
>   drivers/net/wireless/intel/iwlwifi/mvm/ops.c  | 68 +++++++++++++++
>   .../net/wireless/intel/iwlwifi/mvm/utils.c    | 30 +++++++
>   include/net/cfg80211.h                        |  4 +-
>   include/net/mac80211.h                        | 11 +++
>   include/uapi/linux/nl80211.h                  |  6 ++
>   net/mac80211/ieee80211_i.h                    |  4 +-
>   net/mac80211/mlme.c                           | 72 ++++++++++++----
>   net/mac80211/trace.h                          | 23 ++++-
>   net/wireless/mlme.c                           | 26 +++---
>   net/wireless/nl80211.c                        | 23 +++--
>   net/wireless/nl80211.h                        |  8 +-
>   net/wireless/trace.h                          | 12 ++-
>   15 files changed, 303 insertions(+), 112 deletions(-)
> 

applied to oem-5.10, thanks

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