Re: [PATCH wireless-next v3 2/8] wifi: mac80211: change public RX API to use link stations

On Thu, Aug 20, 2026 at 10:56:14AM -0700, Jeff Johnson wrote:
> The fix is trivially `= NULL`.

That does fix the first frame in a batch, but it cannot fix the ones after
it. The initialiser runs once, at entry, and mt76_rx_complete() reuses the
same variable for every frame and again in the A-MSDU loop. So once a frame
with a wcid has written a station into it, the next frame without one keeps
that station rather than reading NULL.

That is the case I measured on an MT7922. Sixteen frames out of roughly
4000 were handed a leftover station, and every one had a wcid-bearing frame
ahead of it in the same batch, so an initialiser would not have caught any
of them.

Clearing it on the no-wcid path inside mt76_rx_convert() covers both.

Devin