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authorJohannes Berg <johannes.berg@intel.com>2013-07-31 20:52:03 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-08-20 08:43:03 -0700
commit775f521cd8ebf7edf47e88e6d1424513dc5e70e9 (patch)
treec9067f06224eeb7fd90ea6a9928d374315252cae /net
parent42c8df37807471eac800b06891329e70b789cb44 (diff)
downloadvexpress-lsk-775f521cd8ebf7edf47e88e6d1424513dc5e70e9.tar.gz
mac80211: continue using disabled channels while connected
commit ddfe49b42d8ad4bfdf92d63d4a74f162660d878d upstream. In case the AP has different regulatory information than we do, it can happen that we connect to an AP based on e.g. the world roaming regulatory data, and then update our database with the AP's country information disables the channel the AP is using. If this happens on an HT AP, the bandwidth tracking code will hit the WARN_ON() and disconnect. Since that's not very useful, ignore the channel-disable flag in bandwidth tracking. Reported-by: Chris Wright <chrisw@sous-sol.org> Tested-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/mac80211/mlme.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 1f57de7b7c0..55a42f9c4f3 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -361,8 +361,17 @@ out:
if (ret & IEEE80211_STA_DISABLE_VHT)
vht_chandef = *chandef;
+ /*
+ * Ignore the DISABLED flag when we're already connected and only
+ * tracking the APs beacon for bandwidth changes - otherwise we
+ * might get disconnected here if we connect to an AP, update our
+ * regulatory information based on the AP's country IE and the
+ * information we have is wrong/outdated and disables the channel
+ * that we're actually using for the connection to the AP.
+ */
while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
- IEEE80211_CHAN_DISABLED)) {
+ tracking ? 0 :
+ IEEE80211_CHAN_DISABLED)) {
if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
ret = IEEE80211_STA_DISABLE_HT |
IEEE80211_STA_DISABLE_VHT;