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mac80211: consider QoS Null frames for STA_NULLFUNC_ACKED

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[ Upstream commit 08a5bdde3812993cb8eb7aa9124703df0de28e4b ]

Commit 7b6ddeaf27 ("mac80211: use QoS NDP for AP probing")
let STAs send QoS Null frames as PS triggers if the AP was
a QoS STA.  However, the mac80211 PS stack relies on an
interface flag IEEE80211_STA_NULLFUNC_ACKED for
determining trigger frame ACK, which was not being set for
acked non-QoS Null frames. The effect is an inability to
trigger hardware sleep via IEEE80211_CONF_PS since the QoS
Null frame was seemingly never acked.

This bug only applies to drivers which set both
IEEE80211_HW_REPORTS_TX_ACK_STATUS and
IEEE80211_HW_PS_NULLFUNC_STACK.

Detect the acked QoS Null frame to restore STA power save.

Fixes: 7b6ddeaf27 ("mac80211: use QoS NDP for AP probing")
Signed-off-by: Thomas Pedersen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Johannes Berg <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Thomas Pedersen 2019-11-18 21:35:38 -08:00 • committed by Greg Kroah-Hartman
commit e160bb158d
1 changed files with 2 additions and 1 deletions
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3
net/mac80211/status.c
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@ -1030,7 +1030,8 @@ static void __ieee80211_tx_status(struct ieee80211_hw *hw,
I802_DEBUG_INC(local->dot11FailedCount);
}
if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
if ((ieee80211_is_nullfunc(fc) || ieee80211_is_qos_nullfunc(fc)) &&
ieee80211_has_pm(fc) &&
ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
local->ps_sdata && !(local->scanning)) {