[pulseaudio-discuss] [PATCH v2] bluez5-util: fix profile waiting logic

Georg Chini georg at chini.tk
Mon Mar 27 19:20:42 UTC 2017

On 16.03.2017 22:48, Tanu Kaskinen wrote:
> There were two bugs in the old logic. The first one:
> If a device has two profiles, the old code would start the wait timer
> when the first profile connects, but when the second profile connects,
> the timer would not get stopped and the CONNECTION_CHANGED hook would
> not get fired, because the code for that was inside an if block that
> only gets executed when the first profile connects. As a result,
> module-bluez5-device loading would always be delayed until the wait
> timeout expires.
> The second bug:
> A crash was observed in device_start_waiting_for_profiles(). That
> function is called whenever the connected profile count changes from 0
> to 1. The function also has an assertion that checks that the timer is
> not running when the function is called. That assertion crashed in the
> following scenario with a headset that supports HSP and A2DP:
> 1. First HSP gets connected. The timer is started.
> 2. Then HSP gets disconnected for some reason. The timer is still
> running.
> 3. Then A2DP gets connected. device_start_waiting_for_profiles() is
> called, because the connected profile count changed from 0 to 1 again.
> The timer is already running, so the assertion fails.
> First I thought I'd remove the assertion from
> device_start_waiting_for_profiles() and just restart the timer on the
> second call, but then I figured that when the device returns to the
> "everything disconnected" state in step 2, it would be better to stop
> the timer. The purpose of the timer is to delay the notification of the
> device becoming connected, but if the device becomes disconnected during
> the waiting period, the notification doesn't make sense any more, and
> therefore the timer doesn't make sense either.
> BugLink: https://bugs.freedesktop.org/show_bug.cgi?id=100237
> ---
>   src/modules/bluetooth/bluez5-util.c | 49 ++++++++++++++++++++++++++-----------
>   1 file changed, 35 insertions(+), 14 deletions(-)
> Changes in v2:
>   - Rewrote the patch so that it also fixes the crash bug.
Looks good to me.


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