linux-kernel - Re: [PATCH] Bluetooth: hci_sync: Using hci_cmd_sync

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Date: Wed, 24 Apr 2024 16:13:09 +0200
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Chun-Yi Lee <joeyli.kernel@...il.com>
Cc: Chun-Yi Lee <jlee@...e.com>,
 Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
 Manish Mandlik <mmandlik@...gle.com>, Archie Pusaka <apusaka@...omium.org>,
 Miao-chen Chou <mcchou@...omium.org>, linux-kernel@...r.kernel.org,
 linux-bluetooth@...r.kernel.org
Subject: Re: [PATCH] Bluetooth: hci_sync: Using hci_cmd_sync_submit when
 removing Adv Monitor

Dear Chun-Yi,


Thank you for your patch.

Am 24.04.24 um 15:59 schrieb Lee, Chun-Yi:
> From: Chun-Yi Lee <jlee@...e.com>

Please use imperative mood in the commit message summary:

Use hci_cmd_sync_submit() when removing Adv Monitor

> Since the d883a4669a1de be introduced in v6.4, bluetooth daemon
> got the following failed message of MGMT_OP_REMOVE_ADV_MONITOR
> command when controller is power-off:

Maybe:

Since commit d883a4669a1de, present since Linux v6.4, the daemon 
bluetoothd logs the failure below, if the command 
MGMT_OP_REMOVE_ADV_MONITOR is sent when the controller is powered off.

> bluetoothd[20976]:
> src/adapter.c:reset_adv_monitors_complete() Failed to reset Adv
> Monitors: Failed>

Please make this one line and indent it with four spaces.

> Normally this situation is happened when the bluetoothd deamon

1.  happen*s*
2.  d*ae*mon

> be started manually after system booting. Which means that

is started

> bluetoothd received MGMT_EV_INDEX_ADDED event after kernel

receive*s*

> runs hci_power_off().
> 
> Base on doc/mgmt-api.txt, the MGMT_OP_REMOVE_ADV_MONITOR command

Base*d*

> can be used when the controller is not powered. This patch changes

“This patch …” is redundant. Use: Change the code …

> the code in remove_adv_monitor() to use hci_cmd_sync_submit()
> instead of hci_cmd_sync_queue().

Please document the test setup.

> Fixes: d883a4669a1de ("Bluetooth: hci_sync: Only allow hci_cmd_sync_queue if running")
> Cc: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
> Cc: Manish Mandlik <mmandlik@...gle.com>
> Cc: Archie Pusaka <apusaka@...omium.org>
> Cc: Miao-chen Chou <mcchou@...omium.org>
> Signed-off-by: Chun-Yi Lee <jlee@...e.com>
> ---
>   net/bluetooth/mgmt.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
> index 32ed6e9245a3..21962969411d 100644
> --- a/net/bluetooth/mgmt.c
> +++ b/net/bluetooth/mgmt.c
> @@ -5475,7 +5475,7 @@ static int remove_adv_monitor(struct sock *sk, struct hci_dev *hdev,
>   		goto unlock;
>   	}
>   
> -	err = hci_cmd_sync_queue(hdev, mgmt_remove_adv_monitor_sync, cmd,
> +	err = hci_cmd_sync_submit(hdev, mgmt_remove_adv_monitor_sync, cmd,
>   				 mgmt_remove_adv_monitor_complete);
>   
>   	if (err) {


Kind regards,

Paul