linux-kernel - Re: [PATCH v3 0/4] Disconnect devices before rfkilling adapter

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Date: Mon, 8 Jan 2024 13:05:01 -0500
From: Luiz Augusto von Dentz <luiz.dentz@...il.com>
To: Jonas Dreßler <verdre@...d.nl>
Cc: Marcel Holtmann <marcel@...tmann.org>, Johan Hedberg <johan.hedberg@...il.com>, asahi@...ts.linux.dev, 
	linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org
Subject: Re: [PATCH v3 0/4] Disconnect devices before rfkilling adapter

Hi Jonas,

On Sun, Jan 7, 2024 at 1:03 PM Jonas Dreßler <verdre@...d.nl> wrote:
>
> Apparently the firmware is supposed to power off the bluetooth card
> properly, including disconnecting devices, when we use rfkill to block
> bluetooth. This doesn't work on a lot of laptops though, leading to weird
> issues after turning off bluetooth, like the connection timing out on the
> peripherals which were connected, and bluetooth not connecting properly
> when the adapter is turned on again after rfkilling.
>
> This series uses the rfkill hook in the bluetooth subsystem
> to execute a few more shutdown commands and make sure that all
> devices get disconnected before we close the HCI connection to the adapter.
>
> ---
>
> v1: https://lore.kernel.org/linux-bluetooth/20240102133311.6712-1-verdre@v0yd.nl/
> v2: https://lore.kernel.org/linux-bluetooth/20240102181946.57288-1-verdre@v0yd.nl/
> v3:
>  - Update commit message titles to reflect what's actually happening
>    (disconnecting devices, not sending a power-off command).
>  - Doing the shutdown sequence synchronously instead of async now.
>  - Move HCI_RFKILLED flag back again to be set before shutdown.
>  - Added a "fallback" hci_dev_do_close() to the error path because
>    hci_set_powered_sync() might bail-out early on error.
>
> Jonas Dreßler (4):
>   Bluetooth: Remove HCI_POWER_OFF_TIMEOUT
>   Bluetooth: mgmt: Remove leftover queuing of power_off work
>   Bluetooth: Add new state HCI_POWERING_DOWN
>   Bluetooth: Disconnect connected devices before rfkilling adapter
>
>  include/net/bluetooth/hci.h |  2 +-
>  net/bluetooth/hci_core.c    | 35 +++++++++++++++++++++++++++++++++--
>  net/bluetooth/hci_sync.c    | 16 +++++++++++-----
>  net/bluetooth/mgmt.c        | 30 ++++++++++++++----------------
>  4 files changed, 59 insertions(+), 24 deletions(-)
>
> --
> 2.43.0

I will probably be applying this sortly, but let's try to add tests to
mgmt-tester just to make sure we don't introduce regressions later,
btw it seems there are a few suspend test that do connect, for
example:

Suspend - Success 5 (Pairing - Legacy) - waiting 1 seconds
random: crng init done
  New connection with handle 0x002a
  Test condition complete, 1 left
Suspend - Success 5 (Pairing - Legacy) - waiting done
  Set the system into Suspend via force_suspend
  New Controller Suspend event received
  Test condition complete, 0 left

-- 
Luiz Augusto von Dentz