linux-kernel - Re: [PATCH v4 1/1] bus: mhi: host: Move IRQ allocation to controller registration phase

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Message-ID: <871qu9rs7n.fsf@kernel.org>
Date:   Mon, 25 Jul 2022 20:57:00 +0300
From:   Kalle Valo <kvalo@...nel.org>
To:     Manivannan Sadhasivam <mani@...nel.org>
Cc:     Qiang Yu <quic_qianyu@...cinc.com>, quic_hemantk@...cinc.com,
        loic.poulain@...aro.org, quic_jhugo@...cinc.com,
        mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_cang@...cinc.com,
        ath11k@...ts.infradead.org
Subject: Re: [PATCH v4 1/1] bus: mhi: host: Move IRQ allocation to controller registration phase

Manivannan Sadhasivam <mani@...nel.org> writes:

> On Mon, Jul 18, 2022 at 02:15:23PM +0300, Kalle Valo wrote:
>
>> + ath11k list
>> 
>> Manivannan Sadhasivam <mani@...nel.org> writes:
>> 
>> > On Thu, Jun 23, 2022 at 10:43:03AM +0800, Qiang Yu wrote:
>> >> During runtime, the MHI endpoint may be powered up/down several times.
>> >> So instead of allocating and destroying the IRQs all the time, let's just
>> >> enable/disable IRQs during power up/down.
>> >> 
>> >> The IRQs will be allocated during mhi_register_controller() and freed
>> >> during mhi_unregister_controller(). This works well for things like PCI
>> >> hotplug also as once the PCI device gets removed, the controller will
>> >> get unregistered. And once it comes back, it will get registered back
>> >> and even if the IRQ configuration changes (MSI), that will get accounted.
>> >> 
>> >> Signed-off-by: Qiang Yu <quic_qianyu@...cinc.com>
>> >
>> > Applied to mhi-next!
>> 
>> I did a bisect and this patch breaks ath11k during rmmod. I'm on
>> vacation right now so I can't investigate in detail but more info below.
>> 
>
> I just tested linux-next/master next-20220718 on my NUC with QCA6390, but I'm
> not able to reproduce the issue during rmmod! Instead I couldn't connect to AP.
>
> log: https://paste.debian.net/1247788/

I get "Entry not found" for that link. But yeah, there were several
regressions in ath11k while I was away. I except that the could not
connect to AP bug should be fixed now in wireless-next and linux-next.

-- 
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