Commit 8b3f4616 authored by Felix Fietkau's avatar Felix Fietkau Committed by John W. Linville
Browse files

ath9k: reduce the likelihood of baseband hang check false positives



Since baseband hangs are rare, but the hang check function has a high
false positive rate in some situations, we need to add more reliable
indicators.

In AP mode we can use blocked beacon transmissions as an indicator,
they should be rare enough.

In station mode, we can skip the hang check entirely, since a true
hang will trigger beacon loss detection, and mac80211 will rescan,
which leads to a hw reset that will bring the hardware back to life.

To make this more reliable, we need to skip fast channel changes
if the hardware appears to be stuck.
Signed-off-by: default avatarFelix Fietkau <nbd@openwrt.org>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 2ed72229
......@@ -251,6 +251,9 @@ int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw,
if (!ath_stoprecv(sc))
stopped = false;
if (!ath9k_hw_check_alive(ah))
stopped = false;
/* XXX: do not flush receive queue here. We don't want
* to flush data frames already in queue because of
* changing channel. */
......@@ -602,7 +605,15 @@ void ath9k_tasklet(unsigned long data)
spin_lock(&sc->sc_pcu_lock);
if (!ath9k_hw_check_alive(ah))
/*
* Only run the baseband hang check if beacons stop working in AP or
* IBSS mode, because it has a high false positive rate. For station
* mode it should not be necessary, since the upper layers will detect
* this through a beacon miss automatically and the following channel
* change will trigger a hardware reset anyway
*/
if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0 &&
!ath9k_hw_check_alive(ah))
ieee80211_queue_work(sc->hw, &sc->hw_check_work);
if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
......
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