linux-kernel - Re: [PATCH] Bluetooth: qca: If memdump doesn't work, re-enable IBS

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Date: Wed, 22 May 2024 15:18:52 -0700
From: Guenter Roeck <groeck@...gle.com>
To: Douglas Anderson <dianders@...omium.org>
Cc: Marcel Holtmann <marcel@...tmann.org>, Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
	Stephen Boyd <swboyd@...omium.org>, Guenter Roeck <groeck@...omium.org>, 
	Johan Hovold <johan+linaro@...nel.org>, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, 
	Sai Teja Aluvala <quic_saluvala@...cinc.com>, linux-bluetooth@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Bluetooth: qca: If memdump doesn't work, re-enable IBS

On Fri, May 17, 2024 at 5:03 PM Douglas Anderson <dianders@...omiumorg> wrote:
>
> On systems in the field, we are seeing this sometimes in the kernel logs:
>   Bluetooth: qca_controller_memdump() hci0: hci_devcd_init Return:-95
>
> This means that _something_ decided that it wanted to get a memdump
> but then hci_devcd_init() returned -EOPNOTSUPP (AKA -95).
>
> The cleanup code in qca_controller_memdump() when we get back an error
> from hci_devcd_init() undoes most things but forgets to clear
> QCA_IBS_DISABLED. One side effect of this is that, during the next
> suspend, qca_suspend() will always get a timeout.
>
> Let's fix it so that we clear the bit.
>
> Fixes: 06d3fdfcdf5c ("Bluetooth: hci_qca: Add qcom devcoredump support")
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

Reviewed-by: Guenter Roeck <groeck@...omium.org>

> ---
> I'm nowhere near an expert on this code so please give extra eyes on
> this patch. I also have no idea how to reproduce the problem nor even
> how to trigger a memdump to test it. I'd love any advice that folks
> could give. ;-)
>
>  drivers/bluetooth/hci_qca.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index 0c9c9ee56592..1ef12f5a115d 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -1090,6 +1090,7 @@ static void qca_controller_memdump(struct work_struct *work)
>                                 qca->memdump_state = QCA_MEMDUMP_COLLECTED;
>                                 cancel_delayed_work(&qca->ctrl_memdump_timeout);
>                                 clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
> +                               clear_bit(QCA_IBS_DISABLED, &qca->flags);
>                                 mutex_unlock(&qca->hci_memdump_lock);
>                                 return;
>                         }
> --
> 2.45.0.rc1.225.g2a3ae87e7f-goog
>