iwlwifi: Fix throughput stall issue in HT mode for 5000

Similar to 6000 and 1000 series, RTS/CTS is the recommended protection
mechanism for 5000 series in HT mode based on the HW design.

Using RTS/CTS will better protect the inner exchange from interference,
especially in highly-congested environment, it also prevent uCode encounter
TX FIFO underrun and other HT mode related performance issues.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
CC: stable@kernel.org
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-5000.c

@@ -1598,6 +1598,7 @@ struct iwl_cfg iwl5300_agn_cfg = {
 	.use_bsm = false,
 	.ht_greenfield_support = true,
 	.led_compensation = 51,
+	.use_rts_for_ht = true, /* use rts/cts protection */
 	.chain_noise_num_beacons = IWL_CAL_NUM_BEACONS,
 	.sm_ps_mode = WLAN_HT_CAP_SM_PS_DISABLED,
 };
@@ -1622,6 +1623,7 @@ struct iwl_cfg iwl5100_bgn_cfg = {
 	.use_bsm = false,
 	.ht_greenfield_support = true,
 	.led_compensation = 51,
+	.use_rts_for_ht = true, /* use rts/cts protection */
 	.chain_noise_num_beacons = IWL_CAL_NUM_BEACONS,
 };
 
@@ -1667,6 +1669,7 @@ struct iwl_cfg iwl5100_agn_cfg = {
 	.use_bsm = false,
 	.ht_greenfield_support = true,
 	.led_compensation = 51,
+	.use_rts_for_ht = true, /* use rts/cts protection */
 	.chain_noise_num_beacons = IWL_CAL_NUM_BEACONS,
 	.sm_ps_mode = WLAN_HT_CAP_SM_PS_DISABLED,
 };
@@ -1691,6 +1694,7 @@ struct iwl_cfg iwl5350_agn_cfg = {
 	.use_bsm = false,
 	.ht_greenfield_support = true,
 	.led_compensation = 51,
+	.use_rts_for_ht = true, /* use rts/cts protection */
 	.chain_noise_num_beacons = IWL_CAL_NUM_BEACONS,
 	.sm_ps_mode = WLAN_HT_CAP_SM_PS_DISABLED,
 };
@@ -1715,6 +1719,7 @@ struct iwl_cfg iwl5150_agn_cfg = {
 	.use_bsm = false,
 	.ht_greenfield_support = true,
 	.led_compensation = 51,
+	.use_rts_for_ht = true, /* use rts/cts protection */
 	.chain_noise_num_beacons = IWL_CAL_NUM_BEACONS,
 	.sm_ps_mode = WLAN_HT_CAP_SM_PS_DISABLED,
 };