Currently there is no way to restart le scan. It's needed in
preparation for new service scan method. The way it work: it disable,
and then enable le scan on controller. During this restart special flag
is set to make sure we won't remove disable scan work from workqueue.
Signed-off-by: Jakub Pawlowski <jpawlowski@xxxxxxxxxx>
---
include/net/bluetooth/hci_core.h | 10 ++++++++++
net/bluetooth/hci_core.c | 42 ++++++++++++++++++++++++++++++++++++++++
net/bluetooth/hci_event.c | 9 ++++++---
3 files changed, 58 insertions(+), 3 deletions(-)
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 396c098..dad62f4 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -56,6 +56,13 @@ struct inquiry_entry {
struct inquiry_data data;
};
+/* BR/EDR and/or LE discovery state flags: the flags defined here should
+ * represent state of discovery
+ */
+enum {
+ HCI_LE_SCAN_RESTARTING,
+};
+
struct discovery_state {
int type;
enum {
@@ -75,6 +82,7 @@ struct discovery_state {
u32 last_adv_flags;
u8 last_adv_data[HCI_MAX_AD_LENGTH];
u8 last_adv_data_len;
+ unsigned long flags;
};
struct hci_conn_hash {
@@ -337,6 +345,7 @@ struct hci_dev {
unsigned long dev_flags;
struct delayed_work le_scan_disable;
+ struct delayed_work le_scan_restart;
__s8 adv_tx_power;
__u8 adv_data[HCI_MAX_AD_LENGTH];
@@ -1326,6 +1335,7 @@ void hci_sock_dev_event(struct hci_dev *hdev, int event);
#define DISCOV_INTERLEAVED_TIMEOUT 5120 /* msec */
#define DISCOV_INTERLEAVED_INQUIRY_LEN 0x04
#define DISCOV_BREDR_INQUIRY_LEN 0x08
+#define DISCOV_LE_RESTART_DELAY 300 /* msec */
int mgmt_control(struct sock *sk, struct msghdr *msg, size_t len);
int mgmt_new_settings(struct hci_dev *hdev);
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 5c319a4..2c74d21 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2557,6 +2557,7 @@ static int hci_dev_do_close(struct hci_dev *hdev)
cancel_delayed_work(&hdev->service_cache);
cancel_delayed_work_sync(&hdev->le_scan_disable);
+ cancel_delayed_work_sync(&hdev->le_scan_restart);
if (test_bit(HCI_MGMT, &hdev->dev_flags))
cancel_delayed_work_sync(&hdev->rpa_expired);
@@ -3851,6 +3852,8 @@ static void le_scan_disable_work(struct work_struct *work)
BT_DBG("%s", hdev->name);
+ cancel_delayed_work_sync(&hdev->le_scan_restart);
+
hci_req_init(&req, hdev);
hci_req_add_le_scan_disable(&req);
@@ -3860,6 +3863,44 @@ static void le_scan_disable_work(struct work_struct *work)
BT_ERR("Disable LE scanning request failed: err %d", err);
}
+static void le_scan_restart_work_complete(struct hci_dev *hdev, u8 status)
+{
+ clear_bit(HCI_LE_SCAN_RESTARTING, &hdev->discovery.flags);
+
+ if (status)
+ BT_ERR("Failed to restart LE scan: status %d", status);
+}
+
+static void le_scan_restart_work(struct work_struct *work)
+{
+ struct hci_dev *hdev = container_of(work, struct hci_dev,
+ le_scan_restart.work);
+ struct hci_request req;
+ struct hci_cp_le_set_scan_enable cp;
+ int err;
+
+ BT_DBG("%s", hdev->name);
+
+ /* If controller is not scanning we are done. */
+ if (!test_bit(HCI_LE_SCAN, &hdev->dev_flags))
+ return;
+
+ hci_req_init(&req, hdev);
+
+ hci_req_add_le_scan_disable(&req);
+
+ memset(&cp, 0, sizeof(cp));
+ cp.enable = LE_SCAN_ENABLE;
+ cp.filter_dup = LE_SCAN_FILTER_DUP_ENABLE;
+ hci_req_add(&req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(cp), &cp);
+
+ set_bit(HCI_LE_SCAN_RESTARTING, &hdev->discovery.flags);
+
+ err = hci_req_run(&req, le_scan_restart_work_complete);
+ if (err)
+ BT_ERR("Restart LE scan request failed: err %d", err);
+}
+
static void set_random_addr(struct hci_request *req, bdaddr_t *rpa)
{
struct hci_dev *hdev = req->hdev;
@@ -4037,6 +4078,7 @@ struct hci_dev *hci_alloc_dev(void)
INIT_DELAYED_WORK(&hdev->power_off, hci_power_off);
INIT_DELAYED_WORK(&hdev->discov_off, hci_discov_off);
INIT_DELAYED_WORK(&hdev->le_scan_disable, le_scan_disable_work);
+ INIT_DELAYED_WORK(&hdev->le_scan_restart, le_scan_restart_work);
skb_queue_head_init(&hdev->rx_q);
skb_queue_head_init(&hdev->cmd_q);
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index bd0a801..ee19656 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -1157,10 +1157,13 @@ static void hci_cc_le_set_scan_enable(struct hci_dev *hdev,
d->last_adv_data_len, NULL, 0);
}
- /* Cancel this timer so that we don't try to disable scanning
- * when it's already disabled.
+ /* If HCI_LE_SCAN_RESTARTING is set, don't cancel this timer,
+ * because we're just restarting scan. Otherwise cancel it so
+ * that we don't try to disable scanning when it's already
+ * disabled.
*/
- cancel_delayed_work(&hdev->le_scan_disable);
+ if (!test_bit(HCI_LE_SCAN_RESTARTING, &hdev->discovery.flags))
+ cancel_delayed_work(&hdev->le_scan_disable);
clear_bit(HCI_LE_SCAN, &hdev->dev_flags);
--
2.1.0
--
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