RE: [PATCH v3] Bluetooth: hci_qca: Stop IBS timer during BT OFF

[PANICKER HARISH (Temp) (QUIC)]

-----Original Message-----
From: Matthias Kaehlcke <mka@xxxxxxxxxxxx> 
Sent: Tuesday, December 14, 2021 10:53 PM
To: PANICKER HARISH (Temp) (QUIC) <quic_pharish@xxxxxxxxxxx>
Cc: marcel@xxxxxxxxxxxx; johan.hedberg@xxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-bluetooth@xxxxxxxxxxxxxxx; Hemant Gupta (QUIC) <quic_hemantg@xxxxxxxxxxx>; linux-arm-msm@xxxxxxxxxxxxxxx; quic_bgodavar <quic_bgodavar@xxxxxxxxxxx>; rjliao@xxxxxxxxxxxxxx; hbandi@xxxxxxxxxxxxxx; abhishekpandit@xxxxxxxxxxxx; mcchou@xxxxxxxxxxxx; Sai Teja Aluvala (Temp) (QUIC) <quic_saluvala@xxxxxxxxxxx>
Subject: Re: [PATCH v3] Bluetooth: hci_qca: Stop IBS timer during BT OFF

On Tue, Dec 14, 2021 at 05:54:51PM +0530, Panicker Harish wrote:
> The IBS timers are not stopped properly once BT OFF is triggered.
> we could see IBS commands being sent along with version command, so 
> stopped IBS timers while Bluetooth is off.
> 
> Fixes: 3e4be65eb82c ("Bluetooth: hci_qca: Add poweroff support during 
> hci down for wcn3990")
> 
> Signed-off-by: Panicker Harish <quic_pharish@xxxxxxxxxxx>
> ---
>  drivers/bluetooth/hci_qca.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c 
> index dd768a8..6f44b26 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -1928,6 +1928,9 @@ static int qca_power_off(struct hci_dev *hdev)
>  	hu->hdev->hw_error = NULL;
>  	hu->hdev->cmd_timeout = NULL;
>  
> +	mod_timer(&qca->tx_idle_timer, 0);
> +	mod_timer(&qca->wake_retrans_timer, 0);
> +

If one of the timers is already running it wouldn't be stopped by mod_timer().
I think you want a del_timer_sync() here to ensure the timers aren't running when the chip is powered off.

[Harish] : I will check and update in next patch.