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Felix Fietkau
447cc8c89c
After flushing software-pending frames to DMA, mt76_has_tx_pending() only checks DMA ring q->queued. For token-based drivers, q->queued is decremented at DMA consumption, but firmware may not have transmitted the frame yet. Waiting for all tokens is not feasible because data frames may be stuck in firmware powersave/aggregation queues. Track PSD queue tokens (firmware ALTX) per phy using an atomic counter. These frames are sent by firmware immediately without PS buffering, so the counter reliably reaches zero after transmission. Increment the counter in mt76_token_consume() and decrement it in mt76_token_release(), only for PSD queue tokens. Include the counter in mt76_has_tx_pending() so channel switch waits for firmware TX completion of management and nullfunc frames. mt7615 (uses mt76_token_get/put) and non-token drivers are unaffected as they never call mt76_token_consume/release. Signed-off-by: Felix Fietkau <[email protected]>