From: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Date: Wed, 6 Sep 2017 10:45:40 +0000 (+0300)
Subject: cfg80211: honor NL80211_RRF_NO_HT40{MINUS,PLUS}
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4e0854a74f08e6a9d847f2c2cfae7b07c931d125;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

cfg80211: honor NL80211_RRF_NO_HT40{MINUS,PLUS}

Honor the NL80211_RRF_NO_HT40{MINUS,PLUS} flags in
reg_process_ht_flags_channel. Not doing so leads can lead
to a firmware assert in iwlwifi for example.

Fixes: b0d7aa59592b ("cfg80211: allow wiphy specific regdomain management")
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 5fae296a6a58..6e94f6934a0e 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -4,6 +4,7 @@
  * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
  * Copyright 2008-2011	Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
+ * Copyright      2017  Intel Deutschland GmbH
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -1483,7 +1484,9 @@ static void reg_process_ht_flags_channel(struct wiphy *wiphy,
 {
 	struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
 	struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
+	const struct ieee80211_regdomain *regd;
 	unsigned int i;
+	u32 flags;
 
 	if (!is_ht40_allowed(channel)) {
 		channel->flags |= IEEE80211_CHAN_NO_HT40;
@@ -1503,17 +1506,30 @@ static void reg_process_ht_flags_channel(struct wiphy *wiphy,
 			channel_after = c;
 	}
 
+	flags = 0;
+	regd = get_wiphy_regdom(wiphy);
+	if (regd) {
+		const struct ieee80211_reg_rule *reg_rule =
+			freq_reg_info_regd(MHZ_TO_KHZ(channel->center_freq),
+					   regd, MHZ_TO_KHZ(20));
+
+		if (!IS_ERR(reg_rule))
+			flags = reg_rule->flags;
+	}
+
 	/*
 	 * Please note that this assumes target bandwidth is 20 MHz,
 	 * if that ever changes we also need to change the below logic
 	 * to include that as well.
 	 */
-	if (!is_ht40_allowed(channel_before))
+	if (!is_ht40_allowed(channel_before) ||
+	    flags & NL80211_RRF_NO_HT40MINUS)
 		channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
 	else
 		channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
 
-	if (!is_ht40_allowed(channel_after))
+	if (!is_ht40_allowed(channel_after) ||
+	    flags & NL80211_RRF_NO_HT40PLUS)
 		channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
 	else
 		channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;