cfg80211/mac80211: allow any interface to send channel switch notifications

For multi-vif channel switches, we want to send
NL80211_CMD_CH_SWITCH_NOTIFY to the userspace to let it decide whether
other interfaces need to be moved as well.  This is needed when we
want a P2P GO interface to follow the channel of a station, for
example.

Modify the code so that all interfaces can send CSA notifications.
Additionally, send notifications for STA CSA as well.

Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 354163433352..a552736c3e59 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -643,7 +643,9 @@
  * @NL80211_CMD_CH_SWITCH_NOTIFY: An AP or GO may decide to switch channels
  *      independently of the userspace SME, send this event indicating
  *      %NL80211_ATTR_IFINDEX is now on %NL80211_ATTR_WIPHY_FREQ and the
- *      attributes determining channel width.
+ *      attributes determining channel width.  This indication may also be
+ *      sent when a remotely-initiated switch (e.g., when a STA receives a CSA
+ *      from the remote AP) is completed;
  *
  * @NL80211_CMD_CH_SWITCH_STARTED_NOTIFY: Notify that a channel switch
  *      has been started on an interface, regardless of the initiator