Commit da25cf6a authored by Marcel Holtmann's avatar Marcel Holtmann Committed by Johan Hedberg
Browse files

Bluetooth: Report invalid RSSI for service discovery and background scan 



When using Start Service Discovery and when background scanning is used
to report devices, the RSSI is reported or the value 127 is provided in
case RSSI in unavailable.

For Start Discovery the value 0 is reported to keep backwards
compatibility with the existing users.

Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: default avatarJohan Hedberg <johan.hedberg@intel.com>
parent efb2513f

include/net/bluetooth/hci_core.h

+3 −0
Original line number Diff line number Diff line
@@ -75,6 +75,7 @@ struct discovery_state { 
	u32			last_adv_flags;

	u8			last_adv_data[HCI_MAX_AD_LENGTH];

	u8			last_adv_data_len;

	bool			report_invalid_rssi;

	s8			rssi;

	u16			uuid_count;

	u8			(*uuids)[16];
@@ -506,11 +507,13 @@ static inline void discovery_init(struct hci_dev *hdev) 
	INIT_LIST_HEAD(&hdev->discovery.all);

	INIT_LIST_HEAD(&hdev->discovery.unknown);

	INIT_LIST_HEAD(&hdev->discovery.resolve);

	hdev->discovery.report_invalid_rssi = true;

	hdev->discovery.rssi = HCI_RSSI_INVALID;

}



static inline void hci_discovery_filter_clear(struct hci_dev *hdev)

{

	hdev->discovery.report_invalid_rssi = true;

	hdev->discovery.rssi = HCI_RSSI_INVALID;

	hdev->discovery.uuid_count = 0;

	kfree(hdev->discovery.uuids);

net/bluetooth/mgmt.c

+10 −2
Original line number Diff line number Diff line
@@ -3912,6 +3912,7 @@ static int start_discovery(struct sock *sk, struct hci_dev *hdev, 
	hci_discovery_filter_clear(hdev);



	hdev->discovery.type = cp->type;

	hdev->discovery.report_invalid_rssi = false;



	hci_req_init(&req, hdev);
@@ -7022,8 +7023,15 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type, 


	memset(buf, 0, sizeof(buf));



	/* Reset invalid RSSI to 0 to keep backwards API compliance */

	if (rssi == HCI_RSSI_INVALID)

	/* In case of device discovery with BR/EDR devices (pre 1.2), the

	 * RSSI value was reported as 0 when not available. This behavior

	 * is kept when using device discovery. This is required for full

	 * backwards compatibility with the API.

	 *

	 * However when using service discovery, the value 127 will be

	 * returned when the RSSI is not available.

	 */

	if (rssi == HCI_RSSI_INVALID && !hdev->discovery.report_invalid_rssi)

		rssi = 0;



	bacpy(&ev->addr.bdaddr, bdaddr);

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