Hi Kai-Heng,
Thank you for your patch.
Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> writes:
> Commit 0ea9fd001a14 ("Bluetooth: Shutdown controller after workqueues
> are flushed or cancelled") introduced a regression that makes mtkbtsdio
> driver stops working:
> [ 36.593956] Bluetooth: hci0: Firmware already downloaded
> [ 46.814613] Bluetooth: hci0: Execution of wmt command timed out
> [ 46.814619] Bluetooth: hci0: Failed to send wmt func ctrl (-110)
>
> The shutdown callback depends on the result of hdev->rx_work, so we
> should call it before flushing rx_work:
> -> btmtksdio_shutdown()
> -> mtk_hci_wmt_sync()
> -> __hci_cmd_send()
> -> wait for BTMTKSDIO_TX_WAIT_VND_EVT gets cleared
>
> -> btmtksdio_recv_event()
> -> hci_recv_frame()
> -> queue_work(hdev->workqueue, &hdev->rx_work)
> -> clears BTMTKSDIO_TX_WAIT_VND_EVT
>
> So move the shutdown callback before flushing TX/RX queue to resolve the
> issue.
>
> Reported-and-tested-by: Mattijs Korpershoek <mkorpershoek@xxxxxxxxxxxx>
> Tested-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
> Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
> Fixes: 0ea9fd001a14 ("Bluetooth: Shutdown controller after workqueues are flushed or cancelled")
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
> ---
> v2:
> Move the shutdown callback before clearing HCI_UP, otherwise 1)
> shutdown callback won't be called and 2) other routines that depend on
> HCI_UP won't work.
>
> net/bluetooth/hci_core.c | 16 ++++++++--------
> 1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
> index cb2e9e513907..8622da2d9395 100644
> --- a/net/bluetooth/hci_core.c
> +++ b/net/bluetooth/hci_core.c
> @@ -1727,6 +1727,14 @@ int hci_dev_do_close(struct hci_dev *hdev)
> hci_request_cancel_all(hdev);
> hci_req_sync_lock(hdev);
>
> + if (!hci_dev_test_flag(hdev, HCI_UNREGISTER) &&
> + !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
> + test_bit(HCI_UP, &hdev->flags)) {
> + /* Execute vendor specific shutdown routine */
> + if (hdev->shutdown)
> + hdev->shutdown(hdev);
> + }
> +
> if (!test_and_clear_bit(HCI_UP, &hdev->flags)) {
> cancel_delayed_work_sync(&hdev->cmd_timer);
> hci_req_sync_unlock(hdev);
> @@ -1798,14 +1806,6 @@ int hci_dev_do_close(struct hci_dev *hdev)
> clear_bit(HCI_INIT, &hdev->flags);
> }
>
> - if (!hci_dev_test_flag(hdev, HCI_UNREGISTER) &&
> - !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
> - test_bit(HCI_UP, &hdev->flags)) {
> - /* Execute vendor specific shutdown routine */
> - if (hdev->shutdown)
> - hdev->shutdown(hdev);
> - }
> -
> /* flush cmd work */
> flush_work(&hdev->cmd_work);
I confirm this works fine on mt8183-pumpkin using the btmtksdio driver.
Tested-by: Mattijs Korpershoek <mkorpershoek@xxxxxxxxxxxx>
>
> --
> 2.31.1
