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.h | 1 +
include/net/bluetooth/hci_core.h | 2 ++
net/bluetooth/hci_core.c | 42 ++++++++++++++++++++++++++++++++++++++++
net/bluetooth/hci_event.c | 9 ++++++---
4 files changed, 51 insertions(+), 3 deletions(-)
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index d5f85d7..8d43a50 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -203,6 +203,7 @@ enum {
HCI_FAST_CONNECTABLE,
HCI_BREDR_ENABLED,
HCI_LE_SCAN_INTERRUPTED,
+ HCI_LE_SCAN_RESTARTING,
};
/* A mask for the flags that are supposed to remain when a reset happens
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 4e39a5a..1b7f9a6 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -334,6 +334,7 @@ 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];
@@ -1400,6 +1401,7 @@ int hci_update_random_address(struct hci_request *req, bool require_privacy,
u8 *own_addr_type);
void hci_copy_identity_address(struct hci_dev *hdev, bdaddr_t *bdaddr,
u8 *bdaddr_type);
+void hci_restart_le_scan(struct hci_dev *hdev, unsigned long delay);
#define SCO_AIRMODE_MASK 0x0003
#define SCO_AIRMODE_CVSD 0x0000
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 6c162c8..b926b6a 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2560,6 +2560,7 @@ 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);
@@ -3826,6 +3827,8 @@ 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);
@@ -3835,6 +3838,44 @@ static void le_scan_disable_work(struct work_struct *work)
BT_ERR("Disable LE scanning request failed: err %d", err);
}
+void hci_restart_le_scan(struct hci_dev *hdev, unsigned long delay)
+{
+ queue_delayed_work(hdev->workqueue, &hdev->le_scan_restart, delay);
+}
+
+static void le_scan_restart_work_complete(struct hci_dev *hdev, u8 status)
+{
+ clear_bit(HCI_LE_SCAN_RESTARTING, &hdev->dev_flags);
+
+ if (status)
+ BT_ERR("Failed to restart LE scanning: 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);
+
+ hci_req_init(&req, hdev);
+
+ hci_req_add_le_scan_disable(&req);
+
+ memset(&cp, 0, sizeof(cp));
+ cp.enable = LE_SCAN_ENABLE;
+ hci_req_add(&req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(cp), &cp);
+
+ set_bit(HCI_LE_SCAN_RESTARTING, &hdev->dev_flags);
+
+ err = hci_req_run(&req, le_scan_restart_work_complete);
+ if (err)
+ BT_ERR("Disable LE scanning request failed: err %d", err);
+}
+
static void set_random_addr(struct hci_request *req, bdaddr_t *rpa)
{
struct hci_dev *hdev = req->hdev;
@@ -4012,6 +4053,7 @@ 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 2f02ff0..0ea8c57 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->dev_flags))
+ cancel_delayed_work(&hdev->le_scan_disable);
clear_bit(HCI_LE_SCAN, &hdev->dev_flags);
--
2.1.0.rc2.206.gedb03e5
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