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iwlwifi: mvm: Fix channel switch in case of count <= 1 

The code did not consider the case that the channel switch counter
is <= 1, which would result with an inaccurate calculation of the
time event apply time.

As the specification states that in case of counter == 0 the switch
occurs at any time after the reception the frame, and for counter == 1
the switch would happens before the next TBTT, schedule the time
event immediately.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Ilan Peer 2017-08-08 14:56:58 +03:00 committed by Luca Coelho
parent 5f5537ac3f
commit f5d8f50f27
1 changed files with 9 additions and 4 deletions
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13
drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
View File

@ -3875,11 +3875,16 @@ static int iwl_mvm_pre_channel_switch(struct ieee80211_hw *hw,
/* Schedule the time event to a bit before beacon 1,
* to make sure we're in the new channel when the
* GO/AP arrives.
* GO/AP arrives. In case count <= 1 immediately schedule the
* TE (this might result with some packet loss or connection
* loss).
*/
apply_time = chsw->device_timestamp +
((vif->bss_conf.beacon_int * (chsw->count - 1) -
IWL_MVM_CHANNEL_SWITCH_TIME_CLIENT) * 1024);
if (chsw->count <= 1)
apply_time = 0;
else
apply_time = chsw->device_timestamp +
((vif->bss_conf.beacon_int * (chsw->count - 1) -
IWL_MVM_CHANNEL_SWITCH_TIME_CLIENT) * 1024);
if (chsw->block_tx)
iwl_mvm_csa_client_absent(mvm, vif);