ath9k: fix a client mode crash that happens on wpa rekeying

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20155 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/mac80211/patches/590-ath9k_rekey_crash_fix.patch

@@ -0,0 +1,37 @@
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -1353,25 +1353,6 @@ static enum ath9k_pkt_type get_hw_packet
+ 	return htype;
+ }
+ 
+-static bool is_pae(struct sk_buff *skb)
+-{
+-	struct ieee80211_hdr *hdr;
+-	__le16 fc;
+-
+-	hdr = (struct ieee80211_hdr *)skb->data;
+-	fc = hdr->frame_control;
+-
+-	if (ieee80211_is_data(fc)) {
+-		if (ieee80211_is_nullfunc(fc) ||
+-		    /* Port Access Entity (IEEE 802.1X) */
+-		    (skb->protocol == cpu_to_be16(ETH_P_PAE))) {
+-			return true;
+-		}
+-	}
+-
+-	return false;
+-}
+-
+ static int get_hw_crypto_keytype(struct sk_buff *skb)
+ {
+ 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+@@ -1696,7 +1677,7 @@ static void ath_tx_start_dma(struct ath_
+ 			goto tx_done;
+ 		}
+ 
+-		if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) && !is_pae(skb)) {
++		if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
+ 			/*
+ 			 * Try aggregation if it's a unicast data frame
+ 			 * and the destination is HT capable.