Bluetooth: Move shutdown callback before flushing tx and rx queue
authorKai-Heng Feng <kai.heng.feng@canonical.com>
Tue, 10 Aug 2021 04:53:15 +0000 (12:53 +0800)
committerMarcel Holtmann <marcel@holtmann.org>
Mon, 16 Aug 2021 15:48:11 +0000 (17:48 +0200)
commit0ea53674d07fb6db2dd7a7ec2fdc85a12eb246c2
tree4cd132da45450388ab58907cc4c1d352331cae87
parent55981d3541812234e687062926ff199c83f79a39
Bluetooth: Move shutdown callback before flushing tx and rx queue

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@baylibre.com>
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Fixes: 0ea9fd001a14 ("Bluetooth: Shutdown controller after workqueues are flushed or cancelled")
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
net/bluetooth/hci_core.c