This is a note to let you know that I've just added the patch titled
mac80211: connect with HT20 if HT40 is not permitted
to the 3.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mac80211-connect-with-ht20-if-ht40-is-not-permitted.patch
and it can be found in the queue-3.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From 3a40414f826a8f1096d9b94c4a53ef91b25ba28d Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.b...@intel.com>
Date: Mon, 1 Oct 2012 15:52:00 +0200
Subject: mac80211: connect with HT20 if HT40 is not permitted
From: Johannes Berg <johannes.b...@intel.com>
commit 3a40414f826a8f1096d9b94c4a53ef91b25ba28d upstream.
Some changes to fix issues with HT40 APs in Korea
and follow-up changes to allow using HT40 even if
the local regulatory database disallows it caused
issues with iwlwifi (and could cause issues with
other devices); iwlwifi firmware would assert if
you tried to connect to an AP that has an invalid
configuration (e.g. using HT40- on channel 140.)
Fix this, while avoiding the "Korean AP" issue by
disabling HT40 and advertising HT20 to the AP
when connecting.
Reported-by: Florian Reitmeir <flor...@reitmeir.org>
Tested-by: Florian Reitmeir <flor...@reitmeir.org>
Signed-off-by: Johannes Berg <johannes.b...@intel.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
net/mac80211/mlme.c | 30 ++++++++++++++++++++----------
1 file changed, 20 insertions(+), 10 deletions(-)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -3065,22 +3065,32 @@ static int ieee80211_prep_connection(str
ht_cfreq, ht_oper->primary_chan,
cbss->channel->band);
ht_oper = NULL;
+ } else {
+ channel_type = NL80211_CHAN_HT20;
}
}
- if (ht_oper) {
- channel_type = NL80211_CHAN_HT20;
+ if (ht_oper && sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
+ /*
+ * cfg80211 already verified that the channel itself can
+ * be used, but it didn't check that we can do the right
+ * HT type, so do that here as well. If HT40 isn't allowed
+ * on this channel, disable 40 MHz operation.
+ */
- if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
- switch (ht_oper->ht_param &
- IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
- case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
+ switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
+ case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
+ if (cbss->channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
+ ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
+ else
channel_type = NL80211_CHAN_HT40PLUS;
- break;
- case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
+ break;
+ case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
+ if (cbss->channel->flags & IEEE80211_CHAN_NO_HT40MINUS)
+ ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
+ else
channel_type = NL80211_CHAN_HT40MINUS;
- break;
- }
+ break;
}
}
Patches currently in stable-queue which might be from johannes.b...@intel.com
are
queue-3.6/mac80211-connect-with-ht20-if-ht40-is-not-permitted.patch
queue-3.6/iwlwifi-fix-6000-series-channel-switch-command.patch
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