This restores behaviour (including the comment) from now-removed
hci_request.c, and also matches existing code for active scanning.
Without this, the duplicates filter is always active when passive
scanning, which makes it impossible to work with devices that send
nontrivial dynamic data in their advertisement reports.
Signed-off-by: Anton Khirnov <anton@xxxxxxxxxxx>
---
net/bluetooth/hci_sync.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index a31d39a821f4..e79cd40bd079 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -3019,6 +3019,20 @@ static int hci_passive_scan_sync(struct hci_dev *hdev)
} else if (hci_is_adv_monitoring(hdev)) {
window = hdev->le_scan_window_adv_monitor;
interval = hdev->le_scan_int_adv_monitor;
+
+ /* Disable duplicates filter when scanning for advertisement
+ * monitor for the following reasons.
+ *
+ * For HW pattern filtering (ex. MSFT), Realtek and Qualcomm
+ * controllers ignore RSSI_Sampling_Period when the duplicates
+ * filter is enabled.
+ *
+ * For SW pattern filtering, when we're not doing interleaved
+ * scanning, it is necessary to disable duplicates filter,
+ * otherwise hosts can only receive one advertisement and it's
+ * impossible to know if a peer is still in range.
+ */
+ filter_dups = LE_SCAN_FILTER_DUP_DISABLE;
} else {
window = hdev->le_scan_window;
interval = hdev->le_scan_interval;
--
2.39.2
