[PATCH v5 6/7] Bluetooth: Notify adv monitor removed event

[Miao-chen Chou]

This notifies management sockets on MGMT_EV_ADV_MONITOR_REMOVED event.

The following test was performed.
- Start two btmgmt consoles, issue a btmgmt advmon-remove command on one
console and observe a MGMT_EV_ADV_MONITOR_REMOVED event on the other.

Signed-off-by: Miao-chen Chou <mcc...@chromium.org>
---

Changes in v5:
- Fix warnings.

Changes in v4: None
Changes in v3:
- Convert the endianness of the returned handle.

Changes in v2: None

 net/bluetooth/mgmt.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index f4dffd06c3aa2..fed9c17b90dc9 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -156,6 +156,7 @@ static const u16 mgmt_events[] = {
        MGMT_EV_PHY_CONFIGURATION_CHANGED,
        MGMT_EV_EXP_FEATURE_CHANGED,
        MGMT_EV_ADV_MONITOR_ADDED,
+       MGMT_EV_ADV_MONITOR_REMOVED,
 };
 
 static const u16 mgmt_untrusted_commands[] = {
@@ -3864,6 +3865,16 @@ static void mgmt_adv_monitor_added(struct sock *sk, 
struct hci_dev *hdev,
        mgmt_event(MGMT_EV_ADV_MONITOR_ADDED, hdev, &ev, sizeof(ev), sk);
 }
 
+static void mgmt_adv_monitor_removed(struct sock *sk, struct hci_dev *hdev,
+                                    u16 handle)
+{
+       struct mgmt_ev_adv_monitor_added ev;
+
+       ev.monitor_handle = cpu_to_le16(handle);
+
+       mgmt_event(MGMT_EV_ADV_MONITOR_REMOVED, hdev, &ev, sizeof(ev), sk);
+}
+
 static int read_adv_monitor_features(struct sock *sk, struct hci_dev *hdev,
                                     void *data, u16 len)
 {
@@ -4016,6 +4027,7 @@ static int remove_adv_monitor(struct sock *sk, struct 
hci_dev *hdev,
 {
        struct mgmt_cp_remove_adv_monitor *cp = data;
        struct mgmt_rp_remove_adv_monitor rp;
+       unsigned int prev_adv_monitors_cnt;
        u16 handle;
        int err;
 
@@ -4024,6 +4036,7 @@ static int remove_adv_monitor(struct sock *sk, struct 
hci_dev *hdev,
        hci_dev_lock(hdev);
 
        handle = __le16_to_cpu(cp->monitor_handle);
+       prev_adv_monitors_cnt = hdev->adv_monitors_cnt;
 
        err = hci_remove_adv_monitor(hdev, handle);
        if (err == -ENOENT) {
@@ -4032,6 +4045,9 @@ static int remove_adv_monitor(struct sock *sk, struct 
hci_dev *hdev,
                goto unlock;
        }
 
+       if (hdev->adv_monitors_cnt < prev_adv_monitors_cnt)
+               mgmt_adv_monitor_removed(sk, hdev, handle);
+
        hci_dev_unlock(hdev);
 
        rp.monitor_handle = cp->monitor_handle;
-- 
2.26.2