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Bluetooth: Move Start Discovery to req_workqueue

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Since discovery also deals with LE scanning it makes sense to move it
behind the same req_workqueue as other LE scanning changes. This also
simplifies the logic since we do many of the actions in a synchronous
manner.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Johan Hedberg
2015-11-11 08:30:30 +02:00
committed by Marcel Holtmann
parent a1d01db120
commit e68f072b73
3 changed files with 213 additions and 229 deletions
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202
net/bluetooth/hci_request.c
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@@ -1042,8 +1042,209 @@ static void le_scan_restart_work(struct work_struct *work)
le_scan_restart_work_complete(hdev, status);
}
static int bredr_inquiry(struct hci_request *req, unsigned long opt)
{
struct hci_cp_inquiry cp;
/* General inquiry access code (GIAC) */
u8 lap[3] = { 0x33, 0x8b, 0x9e };
BT_DBG("%s", req->hdev->name);
hci_dev_lock(req->hdev);
hci_inquiry_cache_flush(req->hdev);
hci_dev_unlock(req->hdev);
memset(&cp, 0, sizeof(cp));
memcpy(&cp.lap, lap, sizeof(cp.lap));
cp.length = DISCOV_BREDR_INQUIRY_LEN;
hci_req_add(req, HCI_OP_INQUIRY, sizeof(cp), &cp);
return 0;
}
static void cancel_adv_timeout(struct hci_dev *hdev)
{
if (hdev->adv_instance_timeout) {
hdev->adv_instance_timeout = 0;
cancel_delayed_work(&hdev->adv_instance_expire);
}
}
static void disable_advertising(struct hci_request *req)
{
u8 enable = 0x00;
hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
}
static int active_scan(struct hci_request *req, unsigned long opt)
{
uint16_t interval = opt;
struct hci_dev *hdev = req->hdev;
struct hci_cp_le_set_scan_param param_cp;
struct hci_cp_le_set_scan_enable enable_cp;
u8 own_addr_type;
int err;
BT_DBG("%s", hdev->name);
if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
hci_dev_lock(hdev);
/* Don't let discovery abort an outgoing connection attempt
* that's using directed advertising.
*/
if (hci_lookup_le_connect(hdev)) {
hci_dev_unlock(hdev);
return -EBUSY;
}
cancel_adv_timeout(hdev);
hci_dev_unlock(hdev);
disable_advertising(req);
}
/* If controller is scanning, it means the background scanning is
* running. Thus, we should temporarily stop it in order to set the
* discovery scanning parameters.
*/
if (hci_dev_test_flag(hdev, HCI_LE_SCAN))
hci_req_add_le_scan_disable(req);
/* All active scans will be done with either a resolvable private
* address (when privacy feature has been enabled) or non-resolvable
* private address.
*/
err = hci_update_random_address(req, true, &own_addr_type);
if (err < 0)
own_addr_type = ADDR_LE_DEV_PUBLIC;
memset(&param_cp, 0, sizeof(param_cp));
param_cp.type = LE_SCAN_ACTIVE;
param_cp.interval = cpu_to_le16(interval);
param_cp.window = cpu_to_le16(DISCOV_LE_SCAN_WIN);
param_cp.own_address_type = own_addr_type;
hci_req_add(req, HCI_OP_LE_SET_SCAN_PARAM, sizeof(param_cp),
&param_cp);
memset(&enable_cp, 0, sizeof(enable_cp));
enable_cp.enable = LE_SCAN_ENABLE;
enable_cp.filter_dup = LE_SCAN_FILTER_DUP_ENABLE;
hci_req_add(req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(enable_cp),
&enable_cp);
return 0;
}
static int interleaved_discov(struct hci_request *req, unsigned long opt)
{
int err;
BT_DBG("%s", req->hdev->name);
err = active_scan(req, opt);
if (err)
return err;
return bredr_inquiry(req, opt);
}
static void start_discovery(struct hci_dev *hdev, u8 *status)
{
unsigned long timeout;
BT_DBG("%s type %u", hdev->name, hdev->discovery.type);
switch (hdev->discovery.type) {
case DISCOV_TYPE_BREDR:
if (!hci_dev_test_flag(hdev, HCI_INQUIRY))
hci_req_sync(hdev, bredr_inquiry, 0, HCI_CMD_TIMEOUT,
status);
return;
case DISCOV_TYPE_INTERLEAVED:
/* When running simultaneous discovery, the LE scanning time
* should occupy the whole discovery time sine BR/EDR inquiry
* and LE scanning are scheduled by the controller.
*
* For interleaving discovery in comparison, BR/EDR inquiry
* and LE scanning are done sequentially with separate
* timeouts.
*/
if (test_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY,
&hdev->quirks)) {
timeout = msecs_to_jiffies(DISCOV_LE_TIMEOUT);
/* During simultaneous discovery, we double LE scan
* interval. We must leave some time for the controller
* to do BR/EDR inquiry.
*/
hci_req_sync(hdev, interleaved_discov,
DISCOV_LE_SCAN_INT * 2, HCI_CMD_TIMEOUT,
status);
break;
}
timeout = msecs_to_jiffies(hdev->discov_interleaved_timeout);
hci_req_sync(hdev, active_scan, DISCOV_LE_SCAN_INT,
HCI_CMD_TIMEOUT, status);
break;
case DISCOV_TYPE_LE:
timeout = msecs_to_jiffies(DISCOV_LE_TIMEOUT);
hci_req_sync(hdev, active_scan, DISCOV_LE_SCAN_INT,
HCI_CMD_TIMEOUT, status);
break;
default:
*status = HCI_ERROR_UNSPECIFIED;
return;
}
if (*status)
return;
BT_DBG("%s timeout %u ms", hdev->name, jiffies_to_msecs(timeout));
/* When service discovery is used and the controller has a
* strict duplicate filter, it is important to remember the
* start and duration of the scan. This is required for
* restarting scanning during the discovery phase.
*/
if (test_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks) &&
hdev->discovery.result_filtering) {
hdev->discovery.scan_start = jiffies;
hdev->discovery.scan_duration = timeout;
}
queue_delayed_work(hdev->req_workqueue, &hdev->le_scan_disable,
timeout);
}
static void discov_update(struct work_struct *work)
{
struct hci_dev *hdev = container_of(work, struct hci_dev,
discov_update);
u8 status = 0;
switch (hdev->discovery.state) {
case DISCOVERY_STARTING:
start_discovery(hdev, &status);
mgmt_start_discovery_complete(hdev, status);
if (status)
hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
else
hci_discovery_set_state(hdev, DISCOVERY_FINDING);
break;
case DISCOVERY_STOPPED:
default:
return;
}
}
void hci_request_setup(struct hci_dev *hdev)
{
INIT_WORK(&hdev->discov_update, discov_update);
INIT_WORK(&hdev->bg_scan_update, bg_scan_update);
INIT_DELAYED_WORK(&hdev->le_scan_disable, le_scan_disable_work);
INIT_DELAYED_WORK(&hdev->le_scan_restart, le_scan_restart_work);
@@ -1051,6 +1252,7 @@ void hci_request_setup(struct hci_dev *hdev)
void hci_request_cancel_all(struct hci_dev *hdev)
{
cancel_work_sync(&hdev->discov_update);
cancel_work_sync(&hdev->bg_scan_update);
cancel_delayed_work_sync(&hdev->le_scan_disable);
cancel_delayed_work_sync(&hdev->le_scan_restart);