Commit 603bd4dc authored by Emmanuel Grumbach's avatar Emmanuel Grumbach Committed by Greg Kroah-Hartman

mac80211: don't WARN on bad WMM parameters from buggy APs

[ Upstream commit c470bdc1 ]

Apparently, some APs are buggy enough to send a zeroed
WMM IE. Don't WARN on this since this is not caused by a bug
on the client's system.

This aligns the condition of the WARNING in drv_conf_tx
with the validity check in ieee80211_sta_wmm_params.
We will now pick the default values whenever we get
a zeroed WMM IE.

This has been reported here:

Fixes: f409079b ("mac80211: sanity check CW_min/CW_max towards driver")
Signed-off-by: default avatarEmmanuel Grumbach <>
Signed-off-by: default avatarJohannes Berg <>
Signed-off-by: default avatarSasha Levin <>
parent 5515c5bd
......@@ -1861,7 +1861,8 @@ static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
params[ac].acm = acm;
params[ac].uapsd = uapsd;
if (params[ac].cw_min > params[ac].cw_max) {
if (params->cw_min == 0 ||
params[ac].cw_min > params[ac].cw_max) {
"AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
params[ac].cw_min, params[ac].cw_max, aci);
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