mac80211: move fragment flag to info flag as dont-fragment

The purpose of this is two-fold:
 1) by moving it out of tx_data.flags, we can in
    another patch move the radiotap parsing so it
    no longer is in the hotpath
 2) if a device implements fragmentation but can
    optionally skip it, the radiotap request for
    not doing fragmentation may be honoured

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index 7bc8702..f614ce7 100644
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -53,7 +53,8 @@
 	}
 
 	if (info->control.hw_key &&
-	    !(tx->flags & IEEE80211_TX_FRAGMENTED) &&
+	    (info->flags & IEEE80211_TX_CTL_DONTFRAG ||
+	     tx->local->ops->set_frag_threshold) &&
 	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) {
 		/* hwaccel - with no need for SW-generated MMIC */
 		return TX_CONTINUE;