iwlwifi: mvm: read IWL_RX_MPDU_PHY_SHORT_PREAMBLE only for CCK

Due to a general shortage of RX API bits, the firmware is going
to reuse this bit on non-CCK frames to mean something else. Use
it only on CCK frames to prepare for that change.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
index 07ddd7b..9342f61 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
@@ -1408,7 +1408,8 @@ void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
                rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
        }
        /* set the preamble flag if appropriate */
-       if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE)
+       if (rate_n_flags & RATE_MCS_CCK_MSK &&
+           phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE)
                rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
 
        if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) {