iwlwifi: quiet a noisy printk

Timing issues in microcode for some devices can cause a compressed BA to
be sent to the driver prior to returning any a-MPDU notification.
Traces show RTS-CTS is exchanged and then the timer fires which causes an
empty BA to be sent which acknowledges nothing.  This results in a noisy
printk. Only print the message if the bitmap is non-zero.

Signed-off-by:  Don Fry <donald.h.fry@intel.com>
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 db57aea629d93857e6a3b068ce74059b87c0d771..2b078a995729a0bbaa2ccc311fea83fa74bb7e19 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
@@ -1227,7 +1227,8 @@ static int iwlagn_tx_status_reply_compressed_ba(struct iwl_priv *priv,
        struct ieee80211_tx_info *info;
 
        if (unlikely(!agg->wait_for_ba))  {
-               IWL_ERR(priv, "Received BA when not expected\n");
+               if (unlikely(ba_resp->bitmap))
+                       IWL_ERR(priv, "Received BA when not expected\n");
                return -EINVAL;
        }