cfg80211/nl80211: scanning (and mac80211 update to use it)

This patch adds basic scan capability to cfg80211/nl80211 and
changes mac80211 to use it. The BSS list that cfg80211 maintains
is made driver-accessible with a private area in each BSS struct,
but mac80211 doesn't yet use it. That's another large project.

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

1 files changed, 8 insertions, 0 deletions

diff --git a/net/wireless/core.c b/net/wireless/core.c
index 125226476089..3cccd1390cea 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -240,6 +240,8 @@ struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv)
         mutex_init(&drv->mtx);
         mutex_init(&drv->devlist_mtx);
         INIT_LIST_HEAD(&drv->netdev_list);
+        spin_lock_init(&drv->bss_lock);
+        INIT_LIST_HEAD(&drv->bss_list);
 
         device_initialize(&drv->wiphy.dev);
         drv->wiphy.dev.class = &ieee80211_class;
@@ -259,6 +261,9 @@ int wiphy_register(struct wiphy *wiphy)
         int i;
         u16 ifmodes = wiphy->interface_modes;
 
+        if (WARN_ON(wiphy->max_scan_ssids < 1))
+                return -EINVAL;
+
         /* sanity check ifmodes */
         WARN_ON(!ifmodes);
         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
@@ -367,8 +372,11 @@ EXPORT_SYMBOL(wiphy_unregister);
 
 void cfg80211_dev_free(struct cfg80211_registered_device *drv)
 {
+        struct cfg80211_internal_bss *scan, *tmp;
         mutex_destroy(&drv->mtx);
         mutex_destroy(&drv->devlist_mtx);
+        list_for_each_entry_safe(scan, tmp, &drv->bss_list, list)
+                kfree(scan);
         kfree(drv);
 }