[1/2] Bluetooth: fix invalid-bdaddr quirk for non-persistent setup

  Devices that lack persistent storage for the device address can indicate
this by setting the HCI_QUIRK_INVALID_BDADDR which causes the controller
to be marked as unconfigured until user space has set a valid address.

Once configured, the device address must be set on every setup for
controllers with HCI_QUIRK_NON_PERSISTENT_SETUP to avoid marking the
controller as unconfigured and requiring the address to be set again.

Fixes: 740011cfe948 ("Bluetooth: Add new quirk for non-persistent setup settings")
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---
 net/bluetooth/hci_sync.c | 28 +++++++++++-----------------
 1 file changed, 11 insertions(+), 17 deletions(-)
  

Hi Johan,

On Mon, Apr 24, 2023 at 6:35 AM Johan Hovold <johan+linaro@kernel.org> wrote:
>
> Devices that lack persistent storage for the device address can indicate
> this by setting the HCI_QUIRK_INVALID_BDADDR which causes the controller
> to be marked as unconfigured until user space has set a valid address.
>
> Once configured, the device address must be set on every setup for
> controllers with HCI_QUIRK_NON_PERSISTENT_SETUP to avoid marking the
> controller as unconfigured and requiring the address to be set again.
>
> Fixes: 740011cfe948 ("Bluetooth: Add new quirk for non-persistent setup settings")
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> ---
>  net/bluetooth/hci_sync.c | 28 +++++++++++-----------------
>  1 file changed, 11 insertions(+), 17 deletions(-)
>
> diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
> index a8785126df75..f45598b5a532 100644
> --- a/net/bluetooth/hci_sync.c
> +++ b/net/bluetooth/hci_sync.c
> @@ -4573,23 +4573,17 @@ static int hci_dev_setup_sync(struct hci_dev *hdev)
>         invalid_bdaddr = test_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
>
>         if (!ret) {
> -               if (test_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks)) {
> -                       if (!bacmp(&hdev->public_addr, BDADDR_ANY))
> -                               hci_dev_get_bd_addr_from_property(hdev);
> -
> -                       if (bacmp(&hdev->public_addr, BDADDR_ANY) &&
> -                           hdev->set_bdaddr) {
> -                               ret = hdev->set_bdaddr(hdev,
> -                                                      &hdev->public_addr);
> -
> -                               /* If setting of the BD_ADDR from the device
> -                                * property succeeds, then treat the address
> -                                * as valid even if the invalid BD_ADDR
> -                                * quirk indicates otherwise.
> -                                */
> -                               if (!ret)
> -                                       invalid_bdaddr = false;
> -                       }
> +               if (test_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks) &&
> +                   !bacmp(&hdev->public_addr, BDADDR_ANY))
> +                       hci_dev_get_bd_addr_from_property(hdev);
> +
> +               if ((invalid_bdaddr ||
> +                    test_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks)) &&
> +                   bacmp(&hdev->public_addr, BDADDR_ANY) &&
> +                   hdev->set_bdaddr) {
> +                       ret = hdev->set_bdaddr(hdev, &hdev->public_addr);
> +                       if (!ret)
> +                               invalid_bdaddr = false;

I'd keep the original comments since it appears you haven't changed
its logic with respect to invalid_bdaddr.

>                 }
>         }
>
> --
> 2.39.2
>
  

On Tue, May 02, 2023 at 04:44:48PM -0700, Luiz Augusto von Dentz wrote:
> Hi Johan,
> 
> On Mon, Apr 24, 2023 at 6:35 AM Johan Hovold <johan+linaro@kernel.org> wrote:
> >
> > Devices that lack persistent storage for the device address can indicate
> > this by setting the HCI_QUIRK_INVALID_BDADDR which causes the controller
> > to be marked as unconfigured until user space has set a valid address.
> >
> > Once configured, the device address must be set on every setup for
> > controllers with HCI_QUIRK_NON_PERSISTENT_SETUP to avoid marking the
> > controller as unconfigured and requiring the address to be set again.
> >
> > Fixes: 740011cfe948 ("Bluetooth: Add new quirk for non-persistent setup settings")
> > Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> > ---
> >  net/bluetooth/hci_sync.c | 28 +++++++++++-----------------
> >  1 file changed, 11 insertions(+), 17 deletions(-)
> >
> > diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
> > index a8785126df75..f45598b5a532 100644
> > --- a/net/bluetooth/hci_sync.c
> > +++ b/net/bluetooth/hci_sync.c
> > @@ -4573,23 +4573,17 @@ static int hci_dev_setup_sync(struct hci_dev *hdev)
> >         invalid_bdaddr = test_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
> >
> >         if (!ret) {
> > -               if (test_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks)) {
> > -                       if (!bacmp(&hdev->public_addr, BDADDR_ANY))
> > -                               hci_dev_get_bd_addr_from_property(hdev);
> > -
> > -                       if (bacmp(&hdev->public_addr, BDADDR_ANY) &&
> > -                           hdev->set_bdaddr) {
> > -                               ret = hdev->set_bdaddr(hdev,
> > -                                                      &hdev->public_addr);
> > -
> > -                               /* If setting of the BD_ADDR from the device
> > -                                * property succeeds, then treat the address
> > -                                * as valid even if the invalid BD_ADDR
> > -                                * quirk indicates otherwise.
> > -                                */
> > -                               if (!ret)
> > -                                       invalid_bdaddr = false;
> > -                       }
> > +               if (test_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks) &&
> > +                   !bacmp(&hdev->public_addr, BDADDR_ANY))
> > +                       hci_dev_get_bd_addr_from_property(hdev);
> > +
> > +               if ((invalid_bdaddr ||
> > +                    test_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks)) &&
> > +                   bacmp(&hdev->public_addr, BDADDR_ANY) &&
> > +                   hdev->set_bdaddr) {
> > +                       ret = hdev->set_bdaddr(hdev, &hdev->public_addr);
> > +                       if (!ret)
> > +                               invalid_bdaddr = false;
> 
> I'd keep the original comments since it appears you haven't changed
> its logic with respect to invalid_bdaddr.

The comment no longer applies as set_bdaddr can now be called also when
there is no "device property" holding the address (e.g. when one has
been set using btmgmt and HCI_QUIRK_NON_PERSISTENT_SETUP is set).

And obviously we shouldn't mark the controller as unconfigured after
we've successfully set an address.

Johan