mac80211: fix HT beacon-based channel switch handling
authorJohannes Berg <johannes.berg@intel.com>
Fri, 3 May 2013 07:35:35 +0000 (09:35 +0200)
committerJohannes Berg <johannes.berg@intel.com>
Thu, 16 May 2013 20:39:40 +0000 (22:39 +0200)
commit04a161f4609dfa387313456fa7ea469fff12cc0d
tree5a2544eb41a476637efeb8a8e71c90013d572a2c
parent03f831a6f7dc02303df20718a4e96821e43b3d0c
mac80211: fix HT beacon-based channel switch handling

When an HT AP is advertising channel switch in a beacon, it
doesn't (and shouldn't, according to 802.11-2012 Table 8-20)
include a secondary channel offset element. The only possible
interpretation is that the previous secondary channel offset
remains valid, so use that when switching channel based only
on beacon information.

VHT requires the Wide Bandwidth Channel Switch subelement to
be present in the Channel Switch Wrapper element, so the code
for that is probably ok (see 802.11ac Draft 4, 8.4.2.165.)

Reported-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
net/mac80211/mlme.c