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Commit f5d8f50f authored by Ilan Peer's avatar Ilan Peer Committed by Luca Coelho
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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: default avatarIlan Peer <ilan.peer@intel.com>
Signed-off-by: default avatarLuca Coelho <luciano.coelho@intel.com>
parent 5f5537ac

drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c

+9 −4
Original line number Diff line number Diff line
@@ -3875,8 +3875,13 @@ 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).

		 */

		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);