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Bluetooth: Fix discovery filter when no RSSI is available 

When no RSSI value is available then make sure that the result is
filtered out when the RSSI threshold filter is active.

This means that all Bluetooth 1.1 or earlier devices will not
report any results when using a RSSI threshold filter.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Marcel Holtmann 2014-12-05 13:03:34 +01:00 committed by Johan Hedberg
parent 189f6ad21f
commit efb2513fd6
2 changed files with 11 additions and 3 deletions
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5
net/bluetooth/hci_event.c
View File

@ -2043,13 +2043,14 @@ static void hci_inquiry_result_evt(struct hci_dev *hdev, struct sk_buff *skb)
data.pscan_mode = info->pscan_mode;
memcpy(data.dev_class, info->dev_class, 3);
data.clock_offset = info->clock_offset;
data.rssi = 0x00;
data.rssi = HCI_RSSI_INVALID;
data.ssp_mode = 0x00;
flags = hci_inquiry_cache_update(hdev, &data, false);
mgmt_device_found(hdev, &info->bdaddr, ACL_LINK, 0x00,
info->dev_class, 0, flags, NULL, 0, NULL, 0);
info->dev_class, HCI_RSSI_INVALID,
flags, NULL, 0, NULL, 0);
}
hci_dev_unlock(hdev);

9
net/bluetooth/mgmt.c
View File

@ -7006,9 +7006,12 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
* if such a RSSI threshold is specified. If a RSSI threshold has
* been specified, then all results with a RSSI smaller than the
* RSSI threshold will be dropped.
*
* For BR/EDR devices (pre 1.2) providing no RSSI during inquiry,
* the results are also dropped.
*/
if (hdev->discovery.rssi != HCI_RSSI_INVALID &&
rssi < hdev->discovery.rssi)
(rssi < hdev->discovery.rssi || rssi == HCI_RSSI_INVALID))
return;
/* Make sure that the buffer is big enough. The 5 extra bytes
@ -7019,6 +7022,10 @@ 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)
rssi = 0;
bacpy(&ev->addr.bdaddr, bdaddr);
ev->addr.type = link_to_bdaddr(link_type, addr_type);
ev->rssi = rssi;