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authorSujith Manoharan <c_manoha@qca.qualcomm.com>2013-06-10 12:19:39 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-04-14 17:44:21 +0400
commiteceee0ba4e042a0f27bbbd82b0dc4c5b0959880a (patch)
tree6127575cffa97ca368788176a2d87645aefc6080 /drivers/net/wireless/ath/ath9k/main.c
parent562c41b16c74779615db9c8cbbf01339f3a73fac (diff)
downloadlinux-eceee0ba4e042a0f27bbbd82b0dc4c5b0959880a.tar.xz
ath9k: Fix noisefloor calibration
commit 696df78509d1f81b651dd98ecdc1aecab616db6b upstream. The commits, "ath9k: Fix regression in channelwidth switch at the same channel" "ath9k: Fix invalid noisefloor reading due to channel update" attempted to fix noisefloor calibration when a channel switch happens due to HT20/HT40 bandwidth change. This is causing invalid readings resulting in messages like: "ath: phy16: NF[0] (-45) > MAX (-95), correcting to MAX". This results in an incorrect noise being used initially for reporting the signal level of received packets, until NF calibration is done and the history buffer is updated via the ANI timer, which happens much later. When a bandwidth change happens, it is appropriate to reset the internal history data for the channel. Do this correctly in the reset() routine by checking the "chanmode" variable. Cc: Rajkumar Manoharan <rmanohar@qca.qualcomm.com> Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com> Signed-off-by: John W. Linville <linville@tuxdriver.com> [bwh: Backported to 3.2: adjust context, indentation] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Cc: Jianguo Wu <wujianguo@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net/wireless/ath/ath9k/main.c')
-rw-r--r--drivers/net/wireless/ath/ath9k/main.c7
1 files changed, 0 insertions, 7 deletions
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index b6d1ac9fb326..ef2605683de7 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1614,13 +1614,6 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
ath_update_survey_stats(sc);
spin_unlock_irqrestore(&common->cc_lock, flags);
- /*
- * Preserve the current channel values, before updating
- * the same channel
- */
- if (ah->curchan && (old_pos == pos))
- ath9k_hw_getnf(ah, ah->curchan);
-
ath9k_cmn_update_ichannel(&sc->sc_ah->channels[pos],
curchan, conf->channel_type);