v4.19.13 snapshot.
diff --git a/net/wireless/ap.c b/net/wireless/ap.c
new file mode 100644
index 0000000..882d97b
--- /dev/null
+++ b/net/wireless/ap.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/ieee80211.h>
+#include <linux/export.h>
+#include <net/cfg80211.h>
+#include "nl80211.h"
+#include "core.h"
+#include "rdev-ops.h"
+
+
+int __cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
+ struct net_device *dev, bool notify)
+{
+ struct wireless_dev *wdev = dev->ieee80211_ptr;
+ int err;
+
+ ASSERT_WDEV_LOCK(wdev);
+
+ if (!rdev->ops->stop_ap)
+ return -EOPNOTSUPP;
+
+ if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP &&
+ dev->ieee80211_ptr->iftype != NL80211_IFTYPE_P2P_GO)
+ return -EOPNOTSUPP;
+
+ if (!wdev->beacon_interval)
+ return -ENOENT;
+
+ err = rdev_stop_ap(rdev, dev);
+ if (!err) {
+ wdev->conn_owner_nlportid = 0;
+ wdev->beacon_interval = 0;
+ memset(&wdev->chandef, 0, sizeof(wdev->chandef));
+ wdev->ssid_len = 0;
+ rdev_set_qos_map(rdev, dev, NULL);
+ if (notify)
+ nl80211_send_ap_stopped(wdev);
+
+ /* Should we apply the grace period during beaconing interface
+ * shutdown also?
+ */
+ cfg80211_sched_dfs_chan_update(rdev);
+ }
+
+ return err;
+}
+
+int cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
+ struct net_device *dev, bool notify)
+{
+ struct wireless_dev *wdev = dev->ieee80211_ptr;
+ int err;
+
+ wdev_lock(wdev);
+ err = __cfg80211_stop_ap(rdev, dev, notify);
+ wdev_unlock(wdev);
+
+ return err;
+}