mac80211: add pre_channel_switch driver operation

Some drivers may need to prepare for a channel switch also when it is
initiated from the remote side (eg. station, P2P client).  To make
this possible, add a generic callback that can be called for all
interface types.

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

1 files changed, 11 insertions, 0 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 3a04f2edd3c3..647a2f6eb7dc 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -3104,6 +3104,7 @@ __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
 {
         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
         struct ieee80211_local *local = sdata->local;
+        struct ieee80211_channel_switch ch_switch;
         struct ieee80211_chanctx_conf *conf;
         struct ieee80211_chanctx *chanctx;
         int err, changed = 0;
@@ -3139,6 +3140,10 @@ __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
                 goto out;
         }
 
+        err = drv_pre_channel_switch(sdata, &ch_switch);
+        if (err)
+                goto out;
+
         err = ieee80211_vif_reserve_chanctx(sdata, &params->chandef,
                                             chanctx->mode,
                                             params->radar_required);
@@ -3152,6 +3157,12 @@ __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
                 goto out;
         }
 
+        ch_switch.timestamp = 0;
+        ch_switch.device_timestamp = 0;
+        ch_switch.block_tx = params->block_tx;
+        ch_switch.chandef = params->chandef;
+        ch_switch.count = params->count;
+
         err = ieee80211_set_csa_beacon(sdata, params, &changed);
         if (err) {
                 ieee80211_vif_unreserve_chanctx(sdata);