rt2x00: Fix TX rate short preamble detection

Mac80211 provides 2 structures to handle bitrates, namely
ieee80211_rate and ieee80211_tx_rate. To determine the short preamble
mode for an outgoing frame, the flag IEEE80211_TX_RC_USE_SHORT_PREAMBLE
must be checked on ieee80211_tx_rate and not ieee80211_rate (which rt2x00 did).

This fixes a regression which was triggered in 2.6.29-rcX as reported by Chris Clayton.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Tested-By: Chris Clayton <chris2553@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c
index 746a8f3..0709dec 100644 (file)
--- a/drivers/net/wireless/rt2x00/rt2x00queue.c
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
@@ -154,6 +154,7 @@ static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
        struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
        struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
+       struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
        struct ieee80211_rate *rate =
            ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
        const struct rt2x00_rate *hwrate;
@@ -313,7 +314,7 @@ static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
                 * When preamble is enabled we should set the
                 * preamble bit for the signal.
                 */
-               if (rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
+               if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
                        txdesc->signal |= 0x08;
        }
 }