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.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Cc: Rajkumar Manoharan <rmanohar@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/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 15dfefcf2d0fca7ef80f3eb64752c47c0bea5d45..b1d5037bff7fc0ac804d0cdc08647940d249b789 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1872,7 +1872,8 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan,
 
        ah->caldata = caldata;
        if (caldata && (chan->channel != caldata->channel ||
-                       chan->channelFlags != caldata->channelFlags)) {
+                       chan->channelFlags != caldata->channelFlags ||
+                       chan->chanmode != caldata->chanmode)) {
                /* Operating channel changed, reset channel calibration data */
                memset(caldata, 0, sizeof(*caldata));
                ath9k_init_nfcal_hist_buffer(ah, chan);

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 5092ecae7706ab7140bcf7d3f88f830be176cc38..35ced100c18385dcfb4d6af5892b8af7cf59d3ec 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1211,13 +1211,6 @@ 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, channel_type);