From 710e4d08f2ab6eed7950884ab30e684704e325ca Mon Sep 17 00:00:00 2001 From: Emmanuel Grumbach Date: Thu, 28 Nov 2013 15:25:21 +0200 Subject: [PATCH] iwlwifi: mvm: don't send SMPS action frame with single RX antenna Products that have only 1 antenna in Rx don't support MIMO in RX. As a consequence, they will be in STATIC always. Don't tell mac80211 to update SMPS in that case. mac80211 would send an action frame to the AP which is clearly bogus. As a matter of fact, we have seen that some APs send a deauth when that happens. Reviewed-by: Johannes Berg Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/iwlwifi/mvm/utils.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/wireless/iwlwifi/mvm/utils.c b/drivers/net/wireless/iwlwifi/mvm/utils.c index 56cf819..f4aff56 100644 --- a/drivers/net/wireless/iwlwifi/mvm/utils.c +++ b/drivers/net/wireless/iwlwifi/mvm/utils.c @@ -518,6 +518,11 @@ void iwl_mvm_update_smps(struct iwl_mvm *mvm, struct ieee80211_vif *vif, int i; lockdep_assert_held(&mvm->mutex); + + /* SMPS is irrelevant for NICs that don't have at least 2 RX antenna */ + if (num_of_ant(iwl_fw_valid_rx_ant(mvm->fw)) == 1) + return; + mvmvif = iwl_mvm_vif_from_mac80211(vif); mvmvif->smps_requests[req_type] = smps_request; for (i = 0; i < NUM_IWL_MVM_SMPS_REQ; i++) { -- 2.7.4