wifi: mac80211: Power-save state and TIM handling fixes

Following up on the v1 discussion [0], this two-patch series:

1. Makes AP-side Power Management (PM) bit handling in ieee80211_rx_h_sta_process() symmetric across both wake-to-doze and doze-to-wake transitions, ignoring the reserved PM bit in non-bufferable management frames while still waking sleeping stations on Authentication and (Re)Association Request frames per commit 9fef65443388 ("mac80211: always update the PM state of a peer on MGMT / DATA frames").

2. Ensures an awake client station sends a wake nullfunc frame in ieee80211_rx_mgmt_beacon() when the Beacon TIM element indicates buffered unicast traffic for its AID, even when dynamic power-save is disabled (dynamic_ps_timeout == 0) and IEEE80211_CONF_PS is not set.

v1 => v2:
- Make non-bufferable MMPDU PM-bit handling symmetric in both directions and expand the commit description.
- Add client-side wake nullfunc transmission in ieee80211_rx_mgmt_beacon() when the TIM bit is set while awake.

[0] https://lore.kernel.org/r/[email protected]

Lee Jones (2):
wifi: mac80211: ignore PM bit in non-bufferable MMPDUs
wifi: mac80211: send wake nullfunc when TIM bit is set while awake

 net/mac80211/mlme.c |  3 ++-
 net/mac80211/rx.c   | 22 ++++++++++++++++------
 2 files changed, 18 insertions(+), 7 deletions(-)

2.56.0.313.g2479322e68-goog