[pulseaudio-tickets] [Bug 94958] New: BlueZ5 module fails to clean out card after headset disconnects

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94958

            Bug ID: 94958
           Summary: BlueZ5 module fails to clean out card after headset
                    disconnects
           Product: PulseAudio
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: modules
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: juha.kuikka at gmail.com
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

Created attachment 122981
  --> https://bugs.freedesktop.org/attachment.cgi?id=122981&action=edit
Patch to fix the issue

SW: Pulseaudio 8.0 / BlueZ 5.39

Symptoms:
While disconnecting/reconnecting a paired bluetooth headset (LG HBS750) audio
fails roughly on every other connection.

On a failed connection "pactl list cards" shows the bluetooth device's card but
"Active Profile: off". Issuing "pacmd set-card-profile X a2dp_sink" makes audio
work immediately.

I realized that when this happened, the previous disconnection did not remove
the card, instead it was only configured for "Active Profile: off" but
otherwise left in place.

Upon looking at PA debug logs I saw that the transport for the a2dp_sink was
first set into disconnected state and then into idle state. In
"device_connection_changed_cb()" this causes the
"pa_bluetooth_device_any_transport_connected()" return true and the
module-bluez5-device is not unloaded.

Further investigation shows that this is caused by a race of
module-bluez5-device.c:thread_func() and MediaPoint1::ClearConfiguration():

When the FD in thread_func() is closed (POLLHUP) an
BLUETOOTH_MESSAGE_STREAM_FD_HUP message is sent into the main thread. The
handler of this message unconditionally sets the transport into IDLE state.
This is a problem if it has already been set into DISCONNECTED state.

See attached patch for a fix.

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