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Bluetooth: Move LE scan disable/restart behind req_workqueue

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To avoid any risks of races, place also these LE scan modification
work callbacks behind the same work queue as the other LE scan
changes.

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 08:11:23 +02:00 • committed by Marcel Holtmann
parent 145a0913ef
commit 7c1fbed239
4 changed files with 183 additions and 173 deletions
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179
net/bluetooth/hci_request.c
View file

@ -858,12 +858,191 @@ static void bg_scan_update(struct work_struct *work)
hci_dev_unlock(hdev);
}
static void inquiry_complete(struct hci_dev *hdev, u8 status, u16 opcode)
{
if (status) {
BT_ERR("Failed to start inquiry: status %d", status);
hci_dev_lock(hdev);
hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
hci_dev_unlock(hdev);
return;
}
}
static void le_scan_disable_work_complete(struct hci_dev *hdev, u8 status)
{
/* General inquiry access code (GIAC) */
u8 lap[3] = { 0x33, 0x8b, 0x9e };
struct hci_cp_inquiry cp;
int err;
if (status) {
BT_ERR("Failed to disable LE scanning: status %d", status);
return;
}
hdev->discovery.scan_start = 0;
switch (hdev->discovery.type) {
case DISCOV_TYPE_LE:
hci_dev_lock(hdev);
hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
hci_dev_unlock(hdev);
break;
case DISCOV_TYPE_INTERLEAVED:
hci_dev_lock(hdev);
if (test_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY,
&hdev->quirks)) {
/* If we were running LE only scan, change discovery
* state. If we were running both LE and BR/EDR inquiry
* simultaneously, and BR/EDR inquiry is already
* finished, stop discovery, otherwise BR/EDR inquiry
* will stop discovery when finished. If we will resolve
* remote device name, do not change discovery state.
*/
if (!test_bit(HCI_INQUIRY, &hdev->flags) &&
hdev->discovery.state != DISCOVERY_RESOLVING)
hci_discovery_set_state(hdev,
DISCOVERY_STOPPED);
} else {
struct hci_request req;
hci_inquiry_cache_flush(hdev);
hci_req_init(&req, hdev);
memset(&cp, 0, sizeof(cp));
memcpy(&cp.lap, lap, sizeof(cp.lap));
cp.length = DISCOV_INTERLEAVED_INQUIRY_LEN;
hci_req_add(&req, HCI_OP_INQUIRY, sizeof(cp), &cp);
err = hci_req_run(&req, inquiry_complete);
if (err) {
BT_ERR("Inquiry request failed: err %d", err);
hci_discovery_set_state(hdev,
DISCOVERY_STOPPED);
}
}
hci_dev_unlock(hdev);
break;
}
}
static void le_scan_disable(struct hci_request *req, unsigned long opt)
{
hci_req_add_le_scan_disable(req);
}
static void le_scan_disable_work(struct work_struct *work)
{
struct hci_dev *hdev = container_of(work, struct hci_dev,
le_scan_disable.work);
u8 status;
int err;
BT_DBG("%s", hdev->name);
cancel_delayed_work(&hdev->le_scan_restart);
err = hci_req_sync(hdev, le_scan_disable, 0, HCI_CMD_TIMEOUT, &status);
if (err)
return;
le_scan_disable_work_complete(hdev, status);
}
static void le_scan_restart_work_complete(struct hci_dev *hdev, u8 status)
{
unsigned long timeout, duration, scan_start, now;
BT_DBG("%s", hdev->name);
if (status) {
BT_ERR("Failed to restart LE scan: status %d", status);
return;
}
hci_dev_lock(hdev);
if (!test_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks) ||
!hdev->discovery.scan_start)
goto unlock;
/* When the scan was started, hdev->le_scan_disable has been queued
* after duration from scan_start. During scan restart this job
* has been canceled, and we need to queue it again after proper
* timeout, to make sure that scan does not run indefinitely.
*/
duration = hdev->discovery.scan_duration;
scan_start = hdev->discovery.scan_start;
now = jiffies;
if (now - scan_start <= duration) {
int elapsed;
if (now >= scan_start)
elapsed = now - scan_start;
else
elapsed = ULONG_MAX - scan_start + now;
timeout = duration - elapsed;
} else {
timeout = 0;
}
queue_delayed_work(hdev->req_workqueue,
&hdev->le_scan_disable, timeout);
unlock:
hci_dev_unlock(hdev);
}
static void le_scan_restart(struct hci_request *req, unsigned long opt)
{
struct hci_dev *hdev = req->hdev;
struct hci_cp_le_set_scan_enable cp;
/* If controller is not scanning we are done. */
if (!hci_dev_test_flag(hdev, HCI_LE_SCAN))
return;
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);
}
static void le_scan_restart_work(struct work_struct *work)
{
struct hci_dev *hdev = container_of(work, struct hci_dev,
le_scan_restart.work);
u8 status;
int err;
BT_DBG("%s", hdev->name);
err = hci_req_sync(hdev, le_scan_restart, 0, HCI_CMD_TIMEOUT, &status);
if (err)
return;
le_scan_restart_work_complete(hdev, status);
}
void hci_request_setup(struct hci_dev *hdev)
{
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);
}
void hci_request_cancel_all(struct hci_dev *hdev)
{
cancel_work_sync(&hdev->bg_scan_update);
cancel_delayed_work_sync(&hdev->le_scan_disable);
cancel_delayed_work_sync(&hdev->le_scan_restart);
}