linux-kernel - Re: [PATCH 2/2] Bluetooth: btqcomsmd: use HCI_QUIRK_USE_BDADDR

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Message-ID: <20181025190358.GY22824@google.com>
Date:   Thu, 25 Oct 2018 12:03:58 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Balakrishna Godavarthi <bgodavar@...eaurora.org>
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Loic Poulain <loic.poulain@...aro.org>,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Brian Norris <briannorris@...omium.org>,
        Dmitry Grinberg <dmitrygr@...gle.com>
Subject: Re: [PATCH 2/2] Bluetooth: btqcomsmd: use
 HCI_QUIRK_USE_BDADDR_PROPERTY

On Thu, Oct 25, 2018 at 08:10:30PM +0530, Balakrishna Godavarthi wrote:
> Hi Matthias,
> 
> On 2018-10-25 05:51, Matthias Kaehlcke wrote:
> > Use the HCI_QUIRK_USE_BDADDR_PROPERTY quirk to let the HCI
> > core handle the reading of 'local-bd-address'. With this there
> > is no need to set HCI_QUIRK_INVALID_BDADDR, the case of a
> > non-existing or invalid fwnode property is handled by the core
> > code.
> > 
> > Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> > ---
> > I couldn't actually test the changes in this driver since I
> > don't have a device with this controller. Could someone
> > from Qualcomm help with this?
> > ---
> >  drivers/bluetooth/btqcomsmd.c | 28 +++-------------------------
> >  1 file changed, 3 insertions(+), 25 deletions(-)
> > 
> > diff --git a/drivers/bluetooth/btqcomsmd.c
> > b/drivers/bluetooth/btqcomsmd.c
> > index 7df3eed1ef5e..e5841602c4f1 100644
> > --- a/drivers/bluetooth/btqcomsmd.c
> > +++ b/drivers/bluetooth/btqcomsmd.c
> > @@ -125,23 +125,10 @@ static int btqcomsmd_setup(struct hci_dev *hdev)
> >  		return PTR_ERR(skb);
> >  	kfree_skb(skb);
> > 
> > -	/* Devices do not have persistent storage for BD address. If no
> > -	 * BD address has been retrieved during probe, mark the device
> > -	 * as having an invalid BD address.
> > +	/* Devices do not have persistent storage for BD address. Retrieve
> > +	 * it from the firmware node property.
> >  	 */
> > -	if (!bacmp(&btq->bdaddr, BDADDR_ANY)) {
> > -		set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
> > -		return 0;
> > -	}
> > -
> > -	/* When setting a configured BD address fails, mark the device
> > -	 * as having an invalid BD address.
> > -	 */
> > -	err = qca_set_bdaddr_rome(hdev, &btq->bdaddr);
> > -	if (err) {
> > -		set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
> > -		return 0;
> > -	}
> > +	set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
> > 
> >  	return 0;
> >  }
> > @@ -169,15 +156,6 @@ static int btqcomsmd_probe(struct platform_device
> > *pdev)
> >  	if (IS_ERR(btq->cmd_channel))
> >  		return PTR_ERR(btq->cmd_channel);
> > 
> > -	/* The local-bd-address property is usually injected by the
> > -	 * bootloader which has access to the allocated BD address.
> > -	 */
> > -	if (!of_property_read_u8_array(pdev->dev.of_node, "local-bd-address",
> > -				       (u8 *)&btq->bdaddr, sizeof(bdaddr_t))) {
> > -		dev_info(&pdev->dev, "BD address %pMR retrieved from device-tree",
> > -			 &btq->bdaddr);
> > -	}
> > -
> >  	hdev = hci_alloc_dev();
> >  	if (!hdev)
> >  		return -ENOMEM;
> 
> nit: can be remove unused "bdaddr_t bdaddr" variable.
> https://elixir.bootlin.com/linux/v4.19-rc8/source/drivers/bluetooth/btqcomsmd.c#L31
> Apart from this, It looks ok to me.

Thanks for the reviews! I'll remove the field in the next revision.