From: Michal Kazior <michal.kazior@tieto.com>
Date: Fri, 10 Oct 2014 10:43:23 +0000 (+0200)
Subject: mac80211: enable DFS with channel contexts
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=486cf4c08fe8b2b049bfccb76ce445ec1088fa25;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

mac80211: enable DFS with channel contexts

It is okay to enable DFS for channel contexts
based drivers as long as no combination advertises
radar detection and multi-channel operation at the
same time.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 107d1c884de3..9e322dce64ec 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -785,13 +785,14 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
 		if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 			return -EINVAL;
 
-		/* DFS currently not supported with channel context drivers */
+		/* DFS is not supported with multi-channel combinations yet */
 		for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 			const struct ieee80211_iface_combination *comb;
 
 			comb = &local->hw.wiphy->iface_combinations[i];
 
-			if (comb->radar_detect_widths)
+			if (comb->radar_detect_widths &&
+			    comb->num_different_channels > 1)
 				return -EINVAL;
 		}
 	}
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 3c61060a4d2b..c76c9d7294ae 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -2526,11 +2526,23 @@ void ieee80211_dfs_radar_detected_work(struct work_struct *work)
 	struct ieee80211_local *local =
 		container_of(work, struct ieee80211_local, radar_detected_work);
 	struct cfg80211_chan_def chandef = local->hw.conf.chandef;
+	struct ieee80211_chanctx *ctx;
+	int num_chanctx = 0;
+
+	mutex_lock(&local->chanctx_mtx);
+	list_for_each_entry(ctx, &local->chanctx_list, list) {
+		if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER)
+			continue;
+
+		num_chanctx++;
+		chandef = ctx->conf.def;
+	}
+	mutex_unlock(&local->chanctx_mtx);
 
 	ieee80211_dfs_cac_cancel(local);
 
-	if (local->use_chanctx)
-		/* currently not handled */
+	if (num_chanctx > 1)
+		/* XXX: multi-channel is not supported yet */
 		WARN_ON(1);
 	else
 		cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);