From: Ben Greear <greearb@xxxxxxxxxxxxxxx>
I have a netgear WNDR3700 that appears to have an off-by-four
bug in how it fills out the hti->control_chan (I configure the
AP to channel 11, it reports 15 as control_chan).
Poke a message into the kernel logs to give users a
clue as to why they are not getting the expected
channel-type or rate.
Signed-off-by: Ben Greear <greearb@xxxxxxxxxxxxxxx>
---
:100644 100644 3221069... 7daabbe... M net/mac80211/mlme.c
net/mac80211/mlme.c | 26 ++++++++++++++++++++++----
1 files changed, 22 insertions(+), 4 deletions(-)
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 3221069..7daabbe 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -161,6 +161,7 @@ static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
struct ieee80211_supported_band *sband;
struct sta_info *sta;
u32 changed = 0;
+ int hti_cfreq;
u16 ht_opmode;
bool enable_ht = true;
enum nl80211_channel_type prev_chantype;
@@ -174,10 +175,27 @@ static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
if (!sband->ht_cap.ht_supported)
enable_ht = false;
- /* check that channel matches the right operating channel */
- if (local->hw.conf.channel->center_freq !=
- ieee80211_channel_to_frequency(hti->control_chan, sband->band))
- enable_ht = false;
+ if (enable_ht) {
+ hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
+ sband->band);
+ /* check that channel matches the right operating channel */
+ if (local->hw.conf.channel->center_freq != hti_cfreq) {
+ /* Some APs mess this up, evidently.
+ * Netgear WNDR3700 sometimes reports 4 higher than
+ * the actual channel, for instance.
+ */
+ printk(KERN_DEBUG
+ "%s: Wrong control channel in association"
+ " response: configured center-freq: %d"
+ " hti-cfreq: %d hti->control_chan: %d"
+ " band: %d. Disabling HT.\n",
+ sdata->name,
+ local->hw.conf.channel->center_freq,
+ hti_cfreq, hti->control_chan,
+ sband->band);
+ enable_ht = false;
+ }
+ }
if (enable_ht) {
channel_type = NL80211_CHAN_HT20;
--
1.7.2.3
--
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