USB: serial: opticon: add chars_in_buffer() implementation

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Add a chars_in_buffer() implementation so that the tty layer will wait
for outgoing buffered data to be drained when needed (e.g. on final
close()).

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>

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Johan Hovold 2020-01-14 12:01:45 +01:00

parent b3a987b026

commit a00e718230

1 changed files with 28 additions and 17 deletions

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45

drivers/usb/serial/opticon.c

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