cfg80211: pass the actual iftype when calling cfg80211_chandef_dfs_required()

There is no need to pass NL80211_IFTYPE_UNSPECIFIED when calling
cfg80211_chandef_dfs_required() since we always already have the
interface type.  So, pass the actual interface type instead.

Additionally, have cfg80211_chandef_dfs_required() WARN if the passed
interface type is NL80211_IFTYPE_UNSPECIFIED, so we can detect
problems more easily.

Tested-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Reported-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index 7a679a6..992b340 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -340,7 +340,6 @@
 	case NL80211_IFTYPE_AP:
 	case NL80211_IFTYPE_P2P_GO:
 	case NL80211_IFTYPE_MESH_POINT:
-	case NL80211_IFTYPE_UNSPECIFIED:
 		width = cfg80211_chandef_get_width(chandef);
 		if (width < 0)
 			return -EINVAL;
@@ -372,6 +371,7 @@
 	case NL80211_IFTYPE_WDS:
 	case NL80211_IFTYPE_P2P_DEVICE:
 		break;
+	case NL80211_IFTYPE_UNSPECIFIED:
 	case NUM_NL80211_IFTYPES:
 		WARN_ON(1);
 	}
@@ -796,8 +796,7 @@
 	    !cfg80211_go_permissive_chan(rdev, chandef->chan))
 		prohibited_flags |= IEEE80211_CHAN_NO_IR;
 
-	if (cfg80211_chandef_dfs_required(wiphy, chandef,
-					  NL80211_IFTYPE_UNSPECIFIED) > 0 &&
+	if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
 	    cfg80211_chandef_dfs_available(wiphy, chandef)) {
 		/* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
 		prohibited_flags = IEEE80211_CHAN_DISABLED;