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authorJohannes Berg <johannes.berg@intel.com>2013-07-31 20:52:03 +0200
committerJohannes Berg <johannes.berg@intel.com>2013-07-31 21:18:17 +0200
commitddfe49b42d8ad4bfdf92d63d4a74f162660d878d (patch)
tree825625c7353a7af610bd977564ca13457f4ce4b5 /net/mac80211
parent74418edec915d0f446debebde08d170c7b8ba0ee (diff)
downloadlinux-ddfe49b42d8ad4bfdf92d63d4a74f162660d878d.tar.bz2
mac80211: continue using disabled channels while connected
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. Cc: stable@vger.kernel.org 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>
Diffstat (limited to 'net/mac80211')
-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 077a95360830..cc9e02d79b55 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -335,8 +335,17 @@ 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+ * information we have is wrong/outdated and disables the channel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;