Commit 08f6f147 authored by Jouni Malinen's avatar Jouni Malinen Committed by Johannes Berg
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cfg80211: Fix 160 MHz channels with 80+80 and 160 MHz drivers 



The VHT supported channel width field is a two bit integer, not a
bitfield. cfg80211_chandef_usable() was interpreting it incorrectly and
ended up rejecting 160 MHz channel width if the driver indicated support
for both 160 and 80+80 MHz channels.

Cc: stable@vger.kernel.org (3.16+)
Fixes: 3d9d1d66 ("nl80211/cfg80211: support VHT channel configuration")
       (however, no real drivers had 160 MHz support it until 3.16)
Signed-off-by: default avatarJouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent d025933e

net/wireless/chan.c

+6 −3
Original line number Diff line number Diff line
@@ -603,7 +603,7 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy, 
{

	struct ieee80211_sta_ht_cap *ht_cap;

	struct ieee80211_sta_vht_cap *vht_cap;

	u32 width, control_freq;

	u32 width, control_freq, cap;



	if (WARN_ON(!cfg80211_chandef_valid(chandef)))

		return false;
@@ -643,7 +643,8 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy, 
			return false;

		break;

	case NL80211_CHAN_WIDTH_80P80:

		if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ))

		cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

		if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)

			return false;

	case NL80211_CHAN_WIDTH_80:

		if (!vht_cap->vht_supported)
@@ -654,7 +655,9 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy, 
	case NL80211_CHAN_WIDTH_160:

		if (!vht_cap->vht_supported)

			return false;

		if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ))

		cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

		if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&

		    cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)

			return false;

		prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;

		width = 160;

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