linux-kernel - [154/244] iwlagn: workaround bug crashing some APs

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Date:	Wed, 28 Sep 2011 15:01:58 -0700
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,
	Don Fry <donald.h.fry@...el.com>,
	Wey-Yi Guy <wey-yi.w.guy@...el.com>,
	"John W. Linville" <linville@...driver.com>
Subject: [154/244] iwlagn: workaround bug crashing some APs

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

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

From: Don Fry <donald.h.fry@...el.com>

commit 2249b011432ca3dcce112f0f71e0f531b4bb9347 upstream.

This patch reverts commit 9b7688328422b88a7a15dc0dc123ad9ab1a6e22d which
was introduced in 2.6.38-rc1.  It works around a problem where the iwlagn
driver stimulates a bug crashing (requiring power cycle to recover) some
APs under heavy traffic.

Signed-off-by: Don Fry <donald.h.fry@...el.com>
SIgned-off-by: Wey-Yi Guy <wey-yi.w.guy@...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-agn.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -2440,7 +2440,12 @@ static int iwl_mac_setup_register(struct
 		    IEEE80211_HW_SPECTRUM_MGMT |
 		    IEEE80211_HW_REPORTS_TX_ACK_STATUS;
 
+	/*
+	 * Including the following line will crash some AP's.  This
+	 * workaround removes the stimulus which causes the crash until
+	 * the AP software can be fixed.
 	hw->max_tx_aggregation_subframes = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
+	 */
 
 	hw->flags |= IEEE80211_HW_SUPPORTS_PS |
 		     IEEE80211_HW_SUPPORTS_DYNAMIC_PS;


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