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Subject: Re: [BUG] Set Powered=true doesn't power up the adapter
From: Marcel Holtmann <marcel@holtmann.org>
In-Reply-To: <CAE6HaMmUL2Dn6H0iBzh6Wrk+DzOzDUHa8fUNGDt6psAc6=JAUw@mail.gmail.com>
Date: Wed, 22 May 2013 08:47:31 +0200
Cc: BlueZ development <linux-bluetooth@vger.kernel.org>
Message-Id: <61DC8CEB-C49A-466F-B5E3-F5B60D398157@holtmann.org>
References: <CAGd9gwhNgRhgqzhxxZNyD-o=j4ksTXvFFhTQMawt4bv0b2VPcQ@mail.gmail.com> <CAE6HaMnFF7ym+FCWpVHCi=7=OJZeaS+uiF_qQDKHgpbzLUUu_w@mail.gmail.com> <CAE6HaMmUL2Dn6H0iBzh6Wrk+DzOzDUHa8fUNGDt6psAc6=JAUw@mail.gmail.com>
To: Vinicius Gomes <vinicius.gomes@openbossa.org>
Sender: linux-bluetooth-owner@vger.kernel.org
List-ID: <linux-bluetooth.vger.kernel.org>

Hi Vinicius,

>> I'm seeing a problem while trying to power on the adapter once in a
>> while just after reboot. What happens is that sending a dbus call to
>> power on the adapter doesn't return. You can read a more detailed
>> description of the bug here [1] but the resume is as follows:
>> 
>> Sending org.freedesktop.DBus.Properties.Set for power up the adapter
>> doesn't return (dbus timeouts after a while) just after reboot. Is a
>> very rare bug, but happens from time to time. Restarting bluetoothd
>> with -n -d to get the logs made it start returning with the error
>> org.bluez.Error.Failed to the same call. I don't see any HCI command
>> with btmon while doing this, so I think it's not a firmware issue at
>> that point (could be some other thing before). From this state, I can
>> call Set several times to power up the adapter, but doesn't work.
>> What is interesting is that if instead of sending MGMT_OP_SET_POWERED
>> from bluetoothd, we try to power up the adapter with hciconfig
>> (calling ioctl(ctl, HCIDEVUP, hdev) ) the adapter goes up and
>> everything works fine from there. We are running kernel 3.8, I don't
>> know if this was already reported in a newer version.
>> 
> 
> I can consistently reproduce it:
> 
> 1. run bluetoothd
> 2. rfkill block all
> 3. test-adapter powered on
> 
> (current bluetooth-next)
> 
> I only got things to work again after a hciconfig up, which makes me
> think that the "rfkill block" confuses the kernel (probably) about the
> state of the controller.

what rfkill block does is to bring the controller down and actually refuse to bring it back up until rfkill unblock happens. If we can bring the controller up via mgmt, then we have a bug.

Regards

Marcel