linux-kernel - Re: [PATCH] Bluetooth: hci_bcm: do not mark valid bd

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Date:   Fri, 2 Jun 2023 10:47:28 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>
Cc:     Matthias Kaehlcke <mka@...omium.org>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Bluetooth: hci_bcm: do not mark valid bd_addr as
 invalid

On 02.06.2023 10:19, Johan Hovold wrote:
> A recent commit restored the original (and still documented) semantics
> for the HCI_QUIRK_USE_BDADDR_PROPERTY quirk so that the device address
> is considered invalid unless an address is provided by firmware.
>
> This specifically means that this flag must only be set for devices with
> invalid addresses, but the Broadcom driver has so far been setting this
> flag unconditionally.
>
> Fortunately the driver already checks for invalid addresses during setup
> and sets the HCI_QUIRK_INVALID_BDADDR flag. Use this flag to indicate
> when the address can be overridden by firmware (long term, this should
> probably just always be allowed).
>
> Fixes: 6ac517d8cf8b ("Bluetooth: fix use-bdaddr-property quirk")
> Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Link: https://lore.kernel.org/lkml/ecef83c8-497f-4011-607b-a63c24764867@samsung.com
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>

> ---
>   drivers/bluetooth/hci_bcm.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
> index 83bf5d4330c4..874d23089b39 100644
> --- a/drivers/bluetooth/hci_bcm.c
> +++ b/drivers/bluetooth/hci_bcm.c
> @@ -643,7 +643,8 @@ static int bcm_setup(struct hci_uart *hu)
>   	 * Allow the bootloader to set a valid address through the
>   	 * device tree.
>   	 */
> -	set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hu->hdev->quirks);
> +	if (test_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks))
> +		set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hu->hdev->quirks);
>   
>   	if (!bcm_request_irq(bcm))
>   		err = bcm_setup_sleep(hu);

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland