https://bugzilla.kernel.org/show_bug.cgi?id=200039 --- Comment #23 from Raghuram Hegde (raghuram.hegde@xxxxxxxxx) --- (In reply to AceLan Kao from comment #22) > I think the behavior should be normal. > When BT dialog is opened, it start accepting all advertisement, and stop > receiving packet after it's closed. This behavior is easy to be observed. > From the full log, packets before #219 are received when the BT dialog is > opened, and #220 is received during S3. > > But the issue is, the advertising packets are only be received after there > is a paired BT4 device(no matter it's connected or not). > It very simple to verify. > > 1. remove all BT devices from BT dialog and close the BT dialog > 2. run "btmon" and got nothing > > 1. pair non-BT4 devices(you can leave it connected) and close BT dialog > 2. nothing from "btmon" if you don't touch the paired device. > > 1. pair BT4 devices and disconnected them(even power off them) > 2. we got advertising packet from other BT4 devices. > > I'm not sure if "Accept all advertisement" is the culprit, but I'm willing > to know if there is any command we can try to disable it to see if it helps. In the full log, you can see that after #123, MGMT command 'Add Device' is sent with Action parameter set to 'Auto-connect remote device (0x02)'. So, when pairing with a LE device, 'HCI_AUTO_CONN_ALWAYS' flag is set. In the HCI Disconnection Complete Event handler (hci_disconn_complete_evt in net/bluetooth/hci_event.c), you can see that if the 'HCI_AUTO_CONN_ALWAYS' flag is set, LE passive scan will be started. Since for a paired LE device, 'HCI_AUTO_CONN_ALWAYS' flag is set, when we disconnect it, LE passive scan will be started. -- You are receiving this mail because: You are the assignee for the bug.
