From e338a85e21d89574a0160fef7a89f42960cc5d7f Mon Sep 17 00:00:00 2001 From: Rajkumar Manoharan Date: Sat, 13 Aug 2011 10:28:17 +0530 Subject: [PATCH] ath9k: Fix invalid noisefloor reading due to channel update While switching b/w HT20/40, the current channel's nf values are updated into history buffer. Since the current channel's channel type, channel flag got updated before reading nf value from hw. This channel type mismatch is causing invalid readings when hw is on ht20 but getnf tries to read on extn chains. Signed-off-by: Rajkumar Manoharan Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/main.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c index 2af4a1c2e2d6..113c1df26b36 100644 --- a/drivers/net/wireless/ath/ath9k/main.c +++ b/drivers/net/wireless/ath/ath9k/main.c @@ -1672,6 +1672,7 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed) if (changed & IEEE80211_CONF_CHANGE_CHANNEL) { struct ieee80211_channel *curchan = hw->conf.channel; + struct ath9k_channel old_chan; int pos = curchan->hw_value; int old_pos = -1; unsigned long flags; @@ -1688,14 +1689,24 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed) "Set channel: %d MHz type: %d\n", curchan->center_freq, conf->channel_type); - ath9k_cmn_update_ichannel(&sc->sc_ah->channels[pos], - curchan, conf->channel_type); - /* update survey stats for the old channel before switching */ spin_lock_irqsave(&common->cc_lock, flags); ath_update_survey_stats(sc); spin_unlock_irqrestore(&common->cc_lock, flags); + /* + * Preserve the current channel values, before updating + * the same channel + */ + if (old_pos == pos) { + memcpy(&old_chan, &sc->sc_ah->channels[pos], + sizeof(struct ath9k_channel)); + ah->curchan = &old_chan; + } + + ath9k_cmn_update_ichannel(&sc->sc_ah->channels[pos], + curchan, conf->channel_type); + /* * If the operating channel changes, change the survey in-use flags * along with it. -- 2.20.1