linux-kernel - Re: [PATCH v2] Bluetooth: btusb: Reject autosuspend if discovery is active

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Message-ID: <19c219ec-a4a2-45a1-b50c-db42fb6db4be@kylinos.cn>
Date: Thu, 8 Jan 2026 10:52:57 +0800
From: Linmao Li <lilinmao@...inos.cn>
To: luiz.dentz@...il.com
Cc: marcel@...tmann.org, linux-kernel@...r.kernel.org,
 linux-bluetooth@...r.kernel.org
Subject: Re: [PATCH v2] Bluetooth: btusb: Reject autosuspend if discovery is
 active

在 2026/1/8 10:06, Linmao Li 写道:

> If USB autosuspend occurs while discovery is active, the ongoing
> HCI operation may not complete successfully. On some devices, this
> can leave discovery.state stuck in DISCOVERY_FINDING.
>
> Signed-off-by: Linmao Li <lilinmao@...inos.cn>
> ---
>   drivers/bluetooth/btusb.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index ded09e94d296..565e276be3b2 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -4469,10 +4469,11 @@ static int btusb_suspend(struct usb_interface *intf, pm_message_t message)
>   
>   	BT_DBG("intf %p", intf);
>   
> -	/* Don't auto-suspend if there are connections; external suspend calls
> -	 * shall never fail.
> +	/* Don't auto-suspend if there are connections or discovery in
> +	 * progress; external suspend calls shall never fail.
>   	 */
> -	if (PMSG_IS_AUTO(message) && hci_conn_count(data->hdev))
> +	if (PMSG_IS_AUTO(message) &&
> +	    (hci_conn_count(data->hdev) || hci_discovery_active(data->hdev)))
>   		return -EBUSY;
>   
>   	if (data->suspend_count++)
Hi Luiz,

I found that hci_discovery_active() is not exported, so btusb as a
module cannot use it:

ERROR: modpost: "hci_discovery_active" [drivers/bluetooth/btusb.ko] 
undefined!

Should I send a separate patch to export hci_discovery_active(), or
revert to v1 using test_bit(HCI_INQUIRY) and hci_dev_test_flag(HCI_LE_SCAN)?

Best regards,
Linmao