iwlwifi: avoid device type checking in generic code

Avoid checking for specified device type to perform certain function,
switch to .cfg approach as more generic and better implementation
method.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>

drivers/net/wireless/iwlwifi/iwl-4965.c

@@ -2259,6 +2259,7 @@ struct iwl_cfg iwl4965_agn_cfg = {
 	.plcp_delta_threshold = IWL_MAX_PLCP_ERR_THRESHOLD_DEF,
 	.monitor_recover_period = IWL_MONITORING_PERIOD,
 	.temperature_kelvin = true,
+	.off_channel_workaround = true,
 };
 
 /* Module firmware */

drivers/net/wireless/iwlwifi/iwl-core.c

@@ -992,12 +992,12 @@ void iwl_set_rxon_chain(struct iwl_priv *priv)
 	rx_chain |= idle_rx_cnt  << RXON_RX_CHAIN_CNT_POS;
 
 	/* copied from 'iwl_bg_request_scan()' */
-	/* Force use of chains B and C (0x6) for Rx for 4965
-	 * Avoid A (0x1) because of its off-channel reception on A-band.
+	/* Force use of chains B and C (0x6) for Rx
+	 * Avoid A (0x1) for the device has off-channel reception on A-band.
 	 * MIMO is not used here, but value is required */
 	if (iwl_is_monitor_mode(priv) &&
 	    !(priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK) &&
-	    ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)) {
+	    priv->cfg->off_channel_workaround) {
 		rx_chain = ANT_ABC << RXON_RX_CHAIN_VALID_POS;
 		rx_chain |= ANT_BC << RXON_RX_CHAIN_FORCE_SEL_POS;
 		rx_chain |= ANT_ABC << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;

drivers/net/wireless/iwlwifi/iwl-core.h

@@ -306,6 +306,7 @@ struct iwl_cfg {
 	/* timer period for monitor the driver queues */
 	u32 monitor_recover_period;
 	bool temperature_kelvin;
+	bool off_channel_workaround;
 };
 
 /***************************

drivers/net/wireless/iwlwifi/iwl-scan.c

@@ -830,10 +830,11 @@ static void iwl_bg_request_scan(struct work_struct *data)
 		 */
 		scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH : 0;
 
-		/* Force use of chains B and C (0x6) for scan Rx for 4965
-		 * Avoid A (0x1) because of its off-channel reception on A-band.
+		/* Force use of chains B and C (0x6) for scan Rx
+		 * Avoid A (0x1) for the device has off-channel reception
+		 * on A-band.
 		 */
-		if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
+		if (priv->cfg->off_channel_workaround)
 			rx_ant = ANT_BC;
 	} else {
 		IWL_WARN(priv, "Invalid scan band count\n");