linux-kernel - [98/98] iwlwifi: Fix throughput stall issue in HT mode for 5000

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Date:	Tue, 26 Jan 2010 15:35:04 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Reinette Chatre <reinette.chatre@...el.com>,
	Wey-Yi Guy <wey-yi.w.guy@...el.com>,
	"John W. Linville" <linville@...driver.com>
Subject: [98/98] iwlwifi: Fix throughput stall issue in HT mode for 5000

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------


From: Wey-Yi Guy <wey-yi.w.guy@...el.com>

commit 1152dcc28c66a74b5b3f1a3ede0aa6729bfd48e4 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@...el.com>
Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/wireless/iwlwifi/iwl-5000.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/net/wireless/iwlwifi/iwl-5000.c
+++ b/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));


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