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iwlwifi: mvm: protect session during CSA

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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>
This commit is contained in:
Luciano Coelho 2014-11-10 11:10:21 +02:00 committed by Emmanuel Grumbach
parent 0c6505c6ed
commit 686e7fe1c4
2 changed files with 22 additions and 0 deletions
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21
drivers/net/wireless/iwlwifi/mvm/mac80211.c
View File

@ -2847,6 +2847,25 @@ static int __iwl_mvm_assign_vif_chanctx(struct iwl_mvm *mvm,
}
if (switching_chanctx && vif->type == NL80211_IFTYPE_STATION) {
u32 duration = 2 * vif->bss_conf.beacon_int;
/* iwl_mvm_protect_session() reads directly from the
* device (the system time), so make sure it is
* available.
*/
ret = iwl_mvm_ref_sync(mvm, IWL_MVM_REF_PROTECT_CSA);
if (ret)
goto out_remove_binding;
/* Protect the session to make sure we hear the first
* beacon on the new channel.
*/
iwl_mvm_protect_session(mvm, vif, duration, duration,
vif->bss_conf.beacon_int / 2,
true);
iwl_mvm_unref(mvm, IWL_MVM_REF_PROTECT_CSA);
iwl_mvm_update_quotas(mvm, NULL);
}
@ -3256,6 +3275,8 @@ static int iwl_mvm_post_channel_switch(struct ieee80211_hw *hw,
ret = iwl_mvm_enable_beacon_filter(mvm, vif, 0);
if (ret)
goto out_unlock;
iwl_mvm_stop_session_protection(mvm, vif);
}
mvmvif->ps_disabled = false;

1
drivers/net/wireless/iwlwifi/mvm/mvm.h
View File

@ -275,6 +275,7 @@ enum iwl_mvm_ref_type {
IWL_MVM_REF_NMI,
IWL_MVM_REF_TM_CMD,
IWL_MVM_REF_EXIT_WORK,
IWL_MVM_REF_PROTECT_CSA,
/* update debugfs.c when changing this */