iwlagn: workaround bug crashing some APs

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.

CC: stable@kernel.org #2.6.39, #3.0.0 #3.1.0
Signed-off-by: Don Fry <donald.h.fry@intel.com>
SIgned-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index b0ae4de7f0834f73401f80ef4d4e9063e4927036..f9c3cd95d614840e529166c2f05775c16233a7cc 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -2140,7 +2140,12 @@ static int iwl_mac_setup_register(struct iwl_priv *priv,
                    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;