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    Subject[PATCH 2/2] Bluetooth: hci_ldisc/hci_serdev: Cancel init work before unregistering
    Date
    If hci_uart_tty_close() or hci_uart_unregister_device() is called while
    hu->init_ready is scheduled, hci_register_dev() could be called after
    the hci_uart is torn down. Avoid this by ensuring the work is complete
    or canceled before checking the HCI_UART_REGISTERED flag.

    Fixes: 9f2aee848fe6 ("Bluetooth: Add delayed init sequence support for UART controllers")
    Signed-off-by: Samuel Holland <samuel@sholland.org>
    ---
    drivers/bluetooth/hci_ldisc.c | 1 +
    drivers/bluetooth/hci_serdev.c | 2 ++
    2 files changed, 3 insertions(+)

    diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
    index 85a30fb9177b..f83d67eafc9f 100644
    --- a/drivers/bluetooth/hci_ldisc.c
    +++ b/drivers/bluetooth/hci_ldisc.c
    @@ -538,6 +538,7 @@ static void hci_uart_tty_close(struct tty_struct *tty)
    clear_bit(HCI_UART_PROTO_READY, &hu->flags);
    percpu_up_write(&hu->proto_lock);

    + cancel_work_sync(&hu->init_ready);
    cancel_work_sync(&hu->write_work);

    if (hdev) {
    diff --git a/drivers/bluetooth/hci_serdev.c b/drivers/bluetooth/hci_serdev.c
    index 7b233312e723..3977bba485c2 100644
    --- a/drivers/bluetooth/hci_serdev.c
    +++ b/drivers/bluetooth/hci_serdev.c
    @@ -355,6 +355,8 @@ void hci_uart_unregister_device(struct hci_uart *hu)
    struct hci_dev *hdev = hu->hdev;

    clear_bit(HCI_UART_PROTO_READY, &hu->flags);
    +
    + cancel_work_sync(&hu->init_ready);
    if (test_bit(HCI_UART_REGISTERED, &hu->flags))
    hci_unregister_dev(hdev);
    hci_free_dev(hdev);
    --
    2.26.2
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