mac80211: BSS info: check channel first

When we receive information about a BSS we check at some point
whether or not we think we're allowed to use the channel it is
on, but we do that fairly late. I don't think we should do it
that late, so do it earlier to avoid doing IBSS/mesh stuff on
that channel and then getting confused because it's disabled.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 11 insertions, 11 deletions

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index a03245255ed0..ae97d7e9945d 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -2602,7 +2602,15 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
         DECLARE_MAC_BUF(mac);
         DECLARE_MAC_BUF(mac2);
 
-        beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
+        if (elems->ds_params && elems->ds_params_len == 1)
+                freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
+        else
+                freq = rx_status->freq;
+
+        channel = ieee80211_get_channel(local->hw.wiphy, freq);
+
+        if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
+                return;
 
         if (ieee80211_vif_is_mesh(&sdata->vif) && elems->mesh_id &&
             elems->mesh_config && mesh_matches_local(elems, sdata)) {
@@ -2645,16 +2653,6 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
                 rcu_read_unlock();
         }
 
-        if (elems->ds_params && elems->ds_params_len == 1)
-                freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
-        else
-                freq = rx_status->freq;
-
-        channel = ieee80211_get_channel(local->hw.wiphy, freq);
-
-        if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
-                return;
-
 #ifdef CONFIG_MAC80211_MESH
         if (elems->mesh_config)
                 bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id,
@@ -2723,6 +2721,8 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 
         bss->band = band;
 
+        beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
+
         bss->timestamp = beacon_timestamp;
         bss->last_update = jiffies;
         bss->signal = rx_status->signal;