Since the 'is_tx = 0' cannot be moved in the whole handler thanks to a doable race involving the delay in switching to STATE_RX_AACK_ON along with a new interrupt, we introduce an intermediate 'was_tx' boolean just for this purpose. There's no Fixes tag applying listed here, several improvements are already https://astra-premium-sites-plugi49371.bleepblogs.com/29113010/helping-the-others-realize-the-advantages-of-wordpress-and-plugins