mac80211: prevent spurious HT/VHT downgrade message

commit 586e01ededf9b713a1512dd658806791a7ca1a50 upstream.

Even when connecting to an AP that doesn't support VHT,
and even when the local device doesn't support it either,
the downgrade message gets printed. Suppress the message
if HT and/or VHT is disabled.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Cc: Andrew Lutomirski <luto@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 9979bf8d162f..e14e676d3bd0 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -3401,6 +3401,10 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
         ret = 0;
 
 out:
+        /* don't print the message below for VHT mismatch if VHT is disabled */
+        if (ret & IEEE80211_STA_DISABLE_VHT)
+                vht_chandef = *chandef;
+
         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
                                         IEEE80211_CHAN_DISABLED)) {
                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {