1:  c66f004516e6 ! 1:  a9bad11cf90a wifi: ath9k: fix beacon slot selection once TSF exceeds 2^39 us
    @@ Commit message
     
         Compute the offset within the beacon interval from the 64-bit TSF
         instead. For TSF values below 2^39 us the result is identical to the
    -    old calculation. TSF_TO_TU() in ath9k.h has no other user and is
    -    removed.
    +    old calculation.
     
         Observed on a TP-Link Archer C7 v2 (QCA9558, AHB) running OpenWrt
         25.12.5 (backports 6.18.26) with three AP interfaces on 2.4 GHz. The
    @@ Commit message
         40 ms average ping RTT (max 117 ms, no loss) over 5 minutes.
     
         ath9k_htc_choose_bslot() in htc_drv_beacon.c uses a similar 32-bit
    -    TU conversion (wrapping every 2^42 us, ~50.9 days); it is addressed
    -    in a separate patch.
    +    TU conversion (wrapping every 2^42 us, ~50.9 days); it is not changed
    +    here as I cannot test it.
     
         Fixes: dd347f2fb2dd ("ath9k: fix beacon timer handling issues")
         Cc: stable@vger.kernel.org
         Signed-off-by: Felix K. <fk@mutemail.de>
     
    - ## drivers/net/wireless/ath/ath9k/ath9k.h ##
    -@@ drivers/net/wireless/ath/ath9k/ath9k.h: void ath9k_set_txpower(struct ath_softc *sc, struct ieee80211_vif *vif);
    - #define ATH_DEFAULT_BINTVAL     	100 /* TU */
    - #define ATH_DEFAULT_BMISS_LIMIT 	10
    - 
    --#define TSF_TO_TU(_h,_l) \
    --	((((u32)(_h)) << 22) | (((u32)(_l)) >> 10))
    --
    - struct ath_beacon {
    - 	enum {
    - 		OK,		/* no change needed */
    -
      ## drivers/net/wireless/ath/ath9k/beacon.c ##
     @@ drivers/net/wireless/ath/ath9k/beacon.c: static int ath9k_beacon_choose_slot(struct ath_softc *sc)
      	struct ath_common *common = ath9k_hw_common(sc->sc_ah);