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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
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@ -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 */