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 20:38:04 +0000 (22:38 +0200)
commit3670946fe2e942bcb09ec9bbc587bf305f9f97da
tree4ee38fe0899a636d991ac704fec207de1b90f039
parentb8360ab8d2caf8a4d0d95bc03f0ba6956459505f
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