mac80211: consider virtual mon when calculating min_def

When calculating the current max bw required for
a channel context, we didn't consider the virtual
monitor interface, resulting in its channel context
being narrower than configured.

This broke monitor mode with iwlmvm, which uses the
minimal width.

Reported-by: Ido Yariv <idox.yariv@intel.com>
Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index f43613a97dd6..0c1ecfdf9a12 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -100,6 +100,12 @@ ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
                 }
                 max_bw = max(max_bw, width);
         }
+
+        /* use the configured bandwidth in case of monitor interface */
+        sdata = rcu_dereference(local->monitor_sdata);
+        if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf)
+                max_bw = max(max_bw, conf->def.width);
+
         rcu_read_unlock();
 
         return max_bw;