cfg80211: add feature to hold bss

In beacon filtering there needs to be a way to not expire the BSS even
when no beacons are received. Add an interface to cfg80211 to hold
BSS and make sure that it's not expired.

Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 26 insertions, 1 deletions

diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 280dbcd02c15..2a00e362f5fe 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -80,7 +80,8 @@ void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
         bool expired = false;
 
         list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
-                if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
+                if (bss->hold ||
+                    !time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
                         continue;
                 list_del(&bss->list);
                 rb_erase(&bss->rbn, &dev->bss_tree);
@@ -471,6 +472,30 @@ void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
 }
 EXPORT_SYMBOL(cfg80211_unlink_bss);
 
+void cfg80211_hold_bss(struct cfg80211_bss *pub)
+{
+        struct cfg80211_internal_bss *bss;
+
+        if (!pub)
+                return;
+
+        bss = container_of(pub, struct cfg80211_internal_bss, pub);
+        bss->hold = true;
+}
+EXPORT_SYMBOL(cfg80211_hold_bss);
+
+void cfg80211_unhold_bss(struct cfg80211_bss *pub)
+{
+        struct cfg80211_internal_bss *bss;
+
+        if (!pub)
+                return;
+
+        bss = container_of(pub, struct cfg80211_internal_bss, pub);
+        bss->hold = false;
+}
+EXPORT_SYMBOL(cfg80211_unhold_bss);
+
 #ifdef CONFIG_WIRELESS_EXT
 int cfg80211_wext_siwscan(struct net_device *dev,
                           struct iw_request_info *info,