rtw_get_on_cur_ch_time
if (rtw_get_on_cur_ch_time(adapter) == 0 ||
jiffies_to_msecs(jiffies - rtw_get_on_cur_ch_time(adapter)) < 2 * adapter->mlmeextpriv.mlmext_info.bcn_interval
unsigned long rtw_get_on_cur_ch_time(struct adapter *adapter);