[ 3.8.y.z extended stable ] Patch "ath9k: avoid accessing MRC registers on single-chain devices" has been added to staging queue

Kamal Mostafa kamal at canonical.com
Thu Sep 19 00:03:24 UTC 2013

This is a note to let you know that I have just added a patch titled

    ath9k: avoid accessing MRC registers on single-chain devices

to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree 
which can be found at:


This patch is scheduled to be released in version

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.8.y.z tree, see



>From dd12cb0ec990eb52ee2096de0a491eaf75ddcbdc Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd at openwrt.org>
Date: Tue, 13 Aug 2013 12:33:28 +0200
Subject: ath9k: avoid accessing MRC registers on single-chain devices

commit a1c781bb20ac1e03280e420abd47a99eb8bbdd3b upstream.

They are not implemented, and accessing them might trigger errors

Signed-off-by: Felix Fietkau <nbd at openwrt.org>
Signed-off-by: John W. Linville <linville at tuxdriver.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
 drivers/net/wireless/ath/ath9k/ar9003_phy.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_phy.c b/drivers/net/wireless/ath/ath9k/ar9003_phy.c
index 3afc24b..e962502 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_phy.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_phy.c
@@ -1072,6 +1072,10 @@ static bool ar9003_hw_ani_control(struct ath_hw *ah,
 		 * is_on == 0 means MRC CCK is OFF (more noise imm)
 		bool is_on = param ? 1 : 0;
+		if (ah->caps.rx_chainmask == 1)
+			break;
 			      AR_PHY_MRC_CCK_ENABLE, is_on);

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