mac80211: free up 2 bytes in skb->cb

Free up 2 bytes in skb->cb to be used for multi-rate retry later.
Move iv_len and icv_len initialization into key alloc.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c
index b7f4fe8fba6e..1676ac484790 100644
--- a/drivers/net/wireless/rt2x00/rt2x00queue.c
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
@@ -374,7 +374,7 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
         struct txentry_desc txdesc;
         struct skb_frame_desc *skbdesc;
-        unsigned int iv_len = IEEE80211_SKB_CB(skb)->control.iv_len;
+        unsigned int iv_len;
 
         if (unlikely(rt2x00queue_full(queue)))
                 return -EINVAL;
@@ -410,8 +410,11 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
          * the frame so we can provide it to the driver seperately.
          */
         if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
-            !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags))
+            !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags) &&
+                (IEEE80211_SKB_CB(skb)->control.hw_key != NULL)) {
+                iv_len = IEEE80211_SKB_CB(skb)->control.hw_key->iv_len;
                 rt2x00crypto_tx_remove_iv(skb, iv_len);
+        }
 
         /*
          * It could be possible that the queue was corrupted and this