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Bluetooth: Add hci_le_scan()

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We are not supposed to block in start_discovery() because
start_discovery code is running in write() syscall context
and this would block the write operation on the mgmt socket.
This way, we cannot directly call hci_do_le_scan() to scan
LE devices in start_discovery(). To overcome this issue a
derefered work (hdev->le_scan) was created so we can properly
call hci_do_le_scan().

The helper function hci_le_scan() simply set LE scan parameters
and queue hdev->le_scan work. The work is queued on system_long_wq
since it can sleep for a few seconds in the worst case (timeout).

Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Andre Guedes 2012-02-03 17:48:00 -03:00 committed by Johan Hedberg
parent 7ba8b4be38
commit 28b75a8948
2 changed files with 41 additions and 0 deletions
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6
include/net/bluetooth/hci_core.h
View file

@ -126,6 +126,7 @@ struct le_scan_params {
u8 type;
u16 interval;
u16 window;
int timeout;
};
#define NUM_REASSEMBLY 4
@ -269,6 +270,9 @@ struct hci_dev {
struct delayed_work le_scan_disable;
struct work_struct le_scan;
struct le_scan_params le_scan_params;
int (*open)(struct hci_dev *hdev);
int (*close)(struct hci_dev *hdev);
int (*flush)(struct hci_dev *hdev);
@ -1033,5 +1037,7 @@ void hci_le_ltk_neg_reply(struct hci_conn *conn);
int hci_do_inquiry(struct hci_dev *hdev, u8 length);
int hci_cancel_inquiry(struct hci_dev *hdev);
int hci_le_scan(struct hci_dev *hdev, u8 type, u16 interval, u16 window,
int timeout);
#endif /* __HCI_CORE_H */

35
net/bluetooth/hci_core.c
View file

@ -735,6 +735,8 @@ static int hci_dev_do_close(struct hci_dev *hdev)
{
BT_DBG("%s %p", hdev->name, hdev);
cancel_work_sync(&hdev->le_scan);
hci_req_cancel(hdev, ENODEV);
hci_req_lock(hdev);
@ -1668,6 +1670,37 @@ static void le_scan_disable_work(struct work_struct *work)
hci_send_cmd(hdev, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(cp), &cp);
}
static void le_scan_work(struct work_struct *work)
{
struct hci_dev *hdev = container_of(work, struct hci_dev, le_scan);
struct le_scan_params *param = &hdev->le_scan_params;
BT_DBG("%s", hdev->name);
hci_do_le_scan(hdev, param->type, param->interval,
param->window, param->timeout);
}
int hci_le_scan(struct hci_dev *hdev, u8 type, u16 interval, u16 window,
int timeout)
{
struct le_scan_params *param = &hdev->le_scan_params;
BT_DBG("%s", hdev->name);
if (work_busy(&hdev->le_scan))
return -EINPROGRESS;
param->type = type;
param->interval = interval;
param->window = window;
param->timeout = timeout;
queue_work(system_long_wq, &hdev->le_scan);
return 0;
}
/* Register HCI device */
int hci_register_dev(struct hci_dev *hdev)
{
@ -1754,6 +1787,8 @@ int hci_register_dev(struct hci_dev *hdev)
atomic_set(&hdev->promisc, 0);
INIT_WORK(&hdev->le_scan, le_scan_work);
INIT_DELAYED_WORK(&hdev->le_scan_disable, le_scan_disable_work);
write_unlock(&hci_dev_list_lock);