Re: [PATCH v1 0/2] Fix for proto races in hci_serdev.
From: Marcel Holtmann
Date: Fri Aug 24 2018 - 14:34:21 EST
> In recent testing we found that while removing hci_uart, we have seen
> execution of hci_uart_write_work() after calling vendor specific
> proto close. As we are freeing the vendor specific Tx and Rx buffers
> in vendor close, execution of functions i.e. Rx or Tx functions may cause
> a crash.
> we already have a commit for hci_ldisc.c "e508e6026b19" and "048e1bd3a27f"
> to overcome the race condition.
> Changes of v1:
> * clearing flag HCI_UART_PROTO_READY while mnodule deinit such that
> we will not have any tractions further on Tx or Rx.
> * added check of HCI_UART_PROTO_READY while dequeuing an packet.
> Balakrishna Godavarthi (2):
> Bluetooth: hci_serdev: clear HCI_UART_PROTO_READY to avoid closing
> proto races
> Bluetooth: hci_serdev: Add protocol check in hci_uart_dequeue().
> drivers/bluetooth/hci_serdev.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
patch has been applied to bluetooth-next tree.