From: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Date: Mon, 10 Jun 2013 08:19:40 +0000 (+0530)
Subject: ath9k: Do not assign noise for NULL caldata
X-Git-Tag: v3.4.55~53
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4984a112df96b876dd107d22ba3598147953b871;p=platform%2Fkernel%2Flinux-stable.git

ath9k: Do not assign noise for NULL caldata

commit d3bcb7b24bbf09fde8405770e676fe0c11c79662 upstream.

ah->noise is maintained globally and not per-channel. This
is updated in the reset() routine after the NF history has been
filled for the *current channel*, just before switching to
the new channel. There is no need to do it inside getnf(), since
ah->noise must contain a value for the new channel.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/net/wireless/ath/ath9k/calib.c b/drivers/net/wireless/ath/ath9k/calib.c
index bbd249d..85e7453 100644
--- a/drivers/net/wireless/ath/ath9k/calib.c
+++ b/drivers/net/wireless/ath/ath9k/calib.c
@@ -389,7 +389,6 @@ bool ath9k_hw_getnf(struct ath_hw *ah, struct ath9k_channel *chan)
 
 	if (!caldata) {
 		chan->noisefloor = nf;
-		ah->noise = ath9k_hw_getchan_noise(ah, chan);
 		return false;
 	}