WLAN_ERP_USE_PROTECTION
erp_info & WLAN_ERP_USE_PROTECTION ?
priv->erp_info |= WLAN_ERP_USE_PROTECTION;
priv->erp_info &= ~WLAN_ERP_USE_PROTECTION;
use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;