From 28b75a89480df99a17c8facd5c33985847d06bb6 Mon Sep 17 00:00:00 2001 From: Andre Guedes Date: Fri, 3 Feb 2012 17:48:00 -0300 Subject: [PATCH] Bluetooth: Add hci_le_scan() 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 Acked-by: Marcel Holtmann Signed-off-by: Johan Hedberg --- include/net/bluetooth/hci_core.h | 6 ++++++ net/bluetooth/hci_core.c | 35 ++++++++++++++++++++++++++++++++ 2 files changed, 41 insertions(+) diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index 3e70872bffea..7107790817a5 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -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 */ diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index ae86cdd80ac0..3d09f4b4ca68 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -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); -- 2.20.1