linux-kernel - Re: [PATCH v2 4/7] Bluetooth: Add new quirk for non-persistent setup settings

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Message-Id: <920B3BE9-3FE8-4AC6-8C5F-63B0E00182AC@holtmann.org>
Date:   Tue, 22 May 2018 09:21:23 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     sean.wang@...iatek.com
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Johan Hedberg <johan.hedberg@...il.com>,
        devicetree <devicetree@...r.kernel.org>,
        BlueZ development <linux-bluetooth@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/7] Bluetooth: Add new quirk for non-persistent setup
 settings

Hi Sean,

> Add a new quirk HCI_QUIRK_NON_PERSISTENT_SETUP allowing that a quirk that
> runs setup() after every open() and not just after the first open().
> 
> Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> ---
> include/net/bluetooth/hci.h | 9 +++++++++
> net/bluetooth/hci_core.c    | 3 ++-
> 2 files changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
> index 1668211..b37d973 100644
> --- a/include/net/bluetooth/hci.h
> +++ b/include/net/bluetooth/hci.h
> @@ -183,6 +183,15 @@ enum {
> 	 * during the hdev->setup vendor callback.
> 	 */
> 	HCI_QUIRK_NON_PERSISTENT_DIAG,
> +
> +	/* When this quirk is set, setup() would be run after every
> +	 * open() and not just after the first open().
> +	 *
> +	 * This quirk can be set before hci_register_dev is called or
> +	 * during the hdev->setup vendor callback.
> +	 *
> +	 */
> +	HCI_QUIRK_NON_PERSISTENT_SETUP,
> };
> 
> /* HCI device flags */
> diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
> index 40d260f..7de712e2 100644
> --- a/net/bluetooth/hci_core.c
> +++ b/net/bluetooth/hci_core.c
> @@ -1377,7 +1377,8 @@ static int hci_dev_do_open(struct hci_dev *hdev)
> 	atomic_set(&hdev->cmd_cnt, 1);
> 	set_bit(HCI_INIT, &hdev->flags);
> 
> -	if (hci_dev_test_flag(hdev, HCI_SETUP)) {
> +	if (hci_dev_test_flag(hdev, HCI_SETUP) ||
> +	    test_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks)) {
> 		hci_sock_dev_event(hdev, HCI_DEV_SETUP);

I am not 100% sure that we want to send the HCI_DEV_SETUP event also multiple times. That is a userspace change that I would need to think about. We need to check create_monitor_event() and see what the btmon trace for this looks like. Can you send me a btmon -w trace.log when this change is active.

Regards

Marcel