iwlwifi: do not set the sequence control bit is not needed

Check the IEEE80211_TX_CTL_ASSIGN_SEQ flag from mac80211, then decide how to
set the TX_CMD_FLG_SEQ_CTL_MSK bit. Setting the wrong bit in BAR frame whill
make the firmware to increment the sequence number which is incorrect and
cause unknown behavior.

CC: stable@vger.kernel.org #3.0+
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
index 35a6b71..df1540c 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
@@ -91,7 +91,10 @@ static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
                tx_cmd->tid_tspec = qc[0] & 0xf;
                tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
        } else {
-               tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
+               if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
+                       tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
+               else
+                       tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
        }
 
        iwlagn_tx_cmd_protection(priv, info, fc, &tx_flags);