[PATCH 167/379][SRU][OEM-5.6] cfg80211: treat 6 GHz channels as valid regardless of capability

[You-Sheng Yang]

From: Johannes Berg <johannes.berg at intel.com>

BugLink: https://bugs.launchpad.net/bugs/1879633

If a 6 GHz channel exists, then we can probably safely assume that
the device actually supports it, and then it should support most
bandwidths.

This will probably need to be extended to check the interface type
and then dig into the HE capabilities for that though, to have the
correct bandwidth check.

Link: https://lore.kernel.org/r/20200528213443.d4864ef52e92.I82f09b2b14a56413ce20376d09967fe954a033eb@changeid
Signed-off-by: Johannes Berg <johannes.berg at intel.com>
(cherry picked from commit ba8f6a037f790147438173029799f54c9d3065f2)
Signed-off-by: You-Sheng Yang <vicamo.yang at canonical.com>
---
 net/wireless/chan.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index fcac5c6366e1..5b508c2d6eaf 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -6,7 +6,7 @@
  *
  * Copyright 2009	Johannes Berg <johannes at sipsolutions.net>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
- * Copyright 2018       Intel Corporation
+ * Copyright 2018-2020	Intel Corporation
  */
 
 #include <linux/export.h>
@@ -910,7 +910,8 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
 		width = 10;
 		break;
 	case NL80211_CHAN_WIDTH_20:
-		if (!ht_cap->ht_supported)
+		if (!ht_cap->ht_supported &&
+		    chandef->chan->band != NL80211_BAND_6GHZ)
 			return false;
 		/* fall through */
 	case NL80211_CHAN_WIDTH_20_NOHT:
@@ -919,6 +920,8 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
 		break;
 	case NL80211_CHAN_WIDTH_40:
 		width = 40;
+		if (chandef->chan->band == NL80211_BAND_6GHZ)
+			break;
 		if (!ht_cap->ht_supported)
 			return false;
 		if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
@@ -933,24 +936,29 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
 		break;
 	case NL80211_CHAN_WIDTH_80P80:
 		cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
-		if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
+		if (chandef->chan->band != NL80211_BAND_6GHZ &&
+		    cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 			return false;
 		/* fall through */
 	case NL80211_CHAN_WIDTH_80:
-		if (!vht_cap->vht_supported)
-			return false;
 		prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
 		width = 80;
+		if (chandef->chan->band == NL80211_BAND_6GHZ)
+			break;
+		if (!vht_cap->vht_supported)
+			return false;
 		break;
 	case NL80211_CHAN_WIDTH_160:
+		prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
+		width = 160;
+		if (chandef->chan->band == NL80211_BAND_6GHZ)
+			break;
 		if (!vht_cap->vht_supported)
 			return false;
 		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;
 		break;
 	default:
 		WARN_ON_ONCE(1);
-- 
2.29.2