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    Bluetooth: Enable duplicates filter in background scan · 4340a124
    Andre Guedes 提交于
    To avoid flooding the host with useless advertising reports during
    background scan, we enable the duplicates filter from controller.
    
    However, enabling duplicates filter requires a small change in
    background scan routine in order to fix the following scenario:
      1) Background scan is running.
      2) A device disconnects and starts advertising.
      3) Before host gets the disconnect event, the advertising is reported
         to host. Since there is no pending LE connection at that time,
         nothing happens.
      4) Host gets the disconnection event and adds a pending connection.
      5) No advertising is reported (since controller is filtering) and the
         connection is never established.
    
    So, to address this scenario, we should always restart background scan
    to unsure we don't miss any advertising report (due to duplicates
    filter).
    Signed-off-by: NAndre Guedes <andre.guedes@openbossa.org>
    Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
    4340a124
hci_core.c 120.8 KB