iwlwifi: Fix throughput stall issue in HT mode for 5000

commit 1152dcc2 upstream

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>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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

@@ -1666,6 +1666,7 @@ struct iwl_cfg iwl5300_agn_cfg = {
 	.valid_rx_ant = ANT_ABC,
 	.need_pll_cfg = true,
 	.ht_greenfield_support = true,
+	.use_rts_for_ht = true, /* use rts/cts protection */
 };
 
 struct iwl_cfg iwl5100_bg_cfg = {
@@ -1717,6 +1718,7 @@ struct iwl_cfg iwl5100_agn_cfg = {
 	.valid_rx_ant = ANT_AB,
 	.need_pll_cfg = true,
 	.ht_greenfield_support = true,
+	.use_rts_for_ht = true, /* use rts/cts protection */
 };
 
 struct iwl_cfg iwl5350_agn_cfg = {
@@ -1734,6 +1736,7 @@ struct iwl_cfg iwl5350_agn_cfg = {
 	.valid_rx_ant = ANT_ABC,
 	.need_pll_cfg = true,
 	.ht_greenfield_support = true,
+	.use_rts_for_ht = true, /* use rts/cts protection */
 };
 
 struct iwl_cfg iwl5150_agn_cfg = {
@@ -1751,6 +1754,7 @@ struct iwl_cfg iwl5150_agn_cfg = {
 	.valid_rx_ant = ANT_AB,
 	.need_pll_cfg = true,
 	.ht_greenfield_support = true,
+	.use_rts_for_ht = true, /* use rts/cts protection */
 };
 
 MODULE_FIRMWARE(IWL5000_MODULE_FIRMWARE(IWL5000_UCODE_API_MAX));