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iwlwifi: mvm: protect session during CSA
When another vif is also running during a channel switch, we need to use a session protection when we move to the new channel, so that we don't miss the beacons. Without this, sometimes the other vif repeatedly gets time exactly when we should be hearing the beacons, preventing channel switch from completing. Adding a session protection that lasts from the moment the channel changes until 2 TBTTs later, ensures that we will hear the beacons on the destination channel. Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>
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parent
0c6505c6ed
commit
686e7fe1c4
2 changed files with 22 additions and 0 deletions
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@ -2847,6 +2847,25 @@ static int __iwl_mvm_assign_vif_chanctx(struct iwl_mvm *mvm,
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}
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if (switching_chanctx && vif->type == NL80211_IFTYPE_STATION) {
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u32 duration = 2 * vif->bss_conf.beacon_int;
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/* iwl_mvm_protect_session() reads directly from the
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* device (the system time), so make sure it is
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* available.
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*/
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ret = iwl_mvm_ref_sync(mvm, IWL_MVM_REF_PROTECT_CSA);
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if (ret)
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goto out_remove_binding;
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/* Protect the session to make sure we hear the first
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* beacon on the new channel.
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*/
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iwl_mvm_protect_session(mvm, vif, duration, duration,
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vif->bss_conf.beacon_int / 2,
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true);
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iwl_mvm_unref(mvm, IWL_MVM_REF_PROTECT_CSA);
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iwl_mvm_update_quotas(mvm, NULL);
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}
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@ -3256,6 +3275,8 @@ static int iwl_mvm_post_channel_switch(struct ieee80211_hw *hw,
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ret = iwl_mvm_enable_beacon_filter(mvm, vif, 0);
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if (ret)
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goto out_unlock;
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iwl_mvm_stop_session_protection(mvm, vif);
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}
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mvmvif->ps_disabled = false;
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@ -275,6 +275,7 @@ enum iwl_mvm_ref_type {
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IWL_MVM_REF_NMI,
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IWL_MVM_REF_TM_CMD,
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IWL_MVM_REF_EXIT_WORK,
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IWL_MVM_REF_PROTECT_CSA,
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/* update debugfs.c when changing this */
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