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From:   Thomas Pedersen <thomas@adapt-ip.com>
To:     Johannes Berg <johannes@sipsolutions.net>
Cc:     linux-wireless <linux-wireless@vger.kernel.org>,
        Thomas Pedersen <thomas@adapt-ip.com>
Subject: [PATCH 06/22] {cfg,mac}80211: get correct default channel width for S1G
Date:   Thu, 27 Aug 2020 15:32:48 -0700
Message-Id: <20200827223304.16155-7-thomas@adapt-ip.com>
In-Reply-To: <20200827223304.16155-1-thomas@adapt-ip.com>
References: <20200827223304.16155-1-thomas@adapt-ip.com>
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Until now, the wifi default channels were assumed to be
NL80211_CHAN_NO_HT, or NL80211_CHAN_WIDTH_20_NOHT. S1G
devices however do not support these channel types/width.
When a default channel width is requested (during default
chandef init, or chanctx removal when not using channel
context), for S1G calculate the correct width. Fixes eg.
configuring strange (20Mhz) width during a scan on the S1G
band.

Signed-off-by: Thomas Pedersen <thomas@adapt-ip.com>
---
 net/mac80211/chan.c |  9 ++++++++-
 net/wireless/chan.c | 10 ++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index bdc0f29dc6cd..8f48aff74c7b 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -536,7 +536,14 @@ static void ieee80211_del_chanctx(struct ieee80211_local *local,
 
 	if (!local->use_chanctx) {
 		struct cfg80211_chan_def *chandef = &local->_oper_chandef;
-		chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
+		/* S1G doesn't have 20MHz, so get the correct width for the
+		 * current channel.
+		 */
+		if (chandef->chan->band == NL80211_BAND_S1GHZ)
+			chandef->width =
+				ieee80211_s1g_channel_width(chandef->chan);
+		else
+			chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 		chandef->center_freq1 = chandef->chan->center_freq;
 		chandef->freq1_offset = chandef->chan->freq_offset;
 		chandef->center_freq2 = 0;
diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index 0a4b8d3eaed9..3bff52d51b05 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -32,6 +32,16 @@ void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
 	chandef->edmg.bw_config = 0;
 	chandef->edmg.channels = 0;
 
+	/* S1G allows a single width per channel, and since chan_type seems to
+	 * be for backwards compatibility only, ignore it and return the per
+	 * frequency width.
+	 */
+	if (chan->band == NL80211_BAND_S1GHZ) {
+		chandef->width = ieee80211_s1g_channel_width(chan);
+		chandef->center_freq1 = chan->center_freq;
+		return;
+	}
+
 	switch (chan_type) {
 	case NL80211_CHAN_NO_HT:
 		chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
-- 
2.20.1