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Date: Tue, 21 May 2024 18:00:12 +0200
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Subject: Re: [PATCH v2] Bluetooth: qca: Fix BT enable failure again for
 QCA6390 after warm reboot
To: Luiz Augusto von Dentz <luiz.dentz@gmail.com>, Lk Sii <lk_sii@163.com>
Cc: Zijun Hu <quic_zijuhu@quicinc.com>, luiz.von.dentz@intel.com,
 marcel@holtmann.org, linux-bluetooth@vger.kernel.org, wt@penguintechs.org,
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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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On 21/05/2024 17:48, Luiz Augusto von Dentz wrote:
>> driver->remove() even is not triggered during above steps.
>>>> Commit C: 272970be3dab ("Bluetooth: hci_qca: Fix driver shutdown on
>>>> closed serdev")
>>>> this commit is to fix issue B which is actually caused by Commit B, but
>>>> it has Fixes tag for Commit A. and it also introduces the regression
>>>> issue A.
>>>>
>>>
>>>
> 
> Reading again the commit message for the UAF fix it sounds like a
> different problem:
> 
>     The driver shutdown callback (which sends EDL_SOC_RESET to the device
>     over serdev) should not be invoked when HCI device is not open (e.g. if
>     hci_dev_open_sync() failed), because the serdev and its TTY are not open
>     either.  Also skip this step if device is powered off
>     (qca_power_shutdown()).
> 
> So if hci_dev_open_sync has failed it says serdev and its TTY will not
> be open either, so I guess that's why HCI_SETUP was added as a
> condition to bail out? So it seems correct to do that although I'd
> change the comments.
> 
> @Krzysztof Kozlowski do you still have a test setup for 272970be3dab
> ("Bluetooth: hci_qca: Fix driver shutdown on closed serdev"), can you
> try with these changes?

Unfortunately not at the moment, because mainline never had a proper
support for a variant of this Bluetooth/WiFi on our boards, so it was
working with few out of tree patches. I think Bartosz is working on
fixing it via power sequence, but that's not in the mainline yet.

Best regards,
Krzysztof