David Newall wrote:
Hi Arjan,
I've not been able to find this file, "drivers/bluetooth/hci_tty.c", but
anyway, This seems to be what happens: Hci_uart_close() flushes using
hci_uart_flush(). Subsequently, in hci_dev_do_close(), (one step in
hci_unregister_dev()), hci_uart_flush() is called again. The comment in
uart_flush_buffer(), relating to the WARN_ON(), indicates you can't
flush after the port is closed; which sounds reasonable. I think
hci_uart_close() should set hdev->flush to NULL before returning.
Hci_dev_do_close() does check for this. The code path is rather
involved and I'm not entirely clear of all steps, but I think that's
what should be done.
Patch for stupidly obsolete kernel attached.
looks reasonable; unfortunately I don't know the tty code well enough to judge this patch...
Alan?
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