> This actually was a side effect of the "byte lost on close" patch
> that I submitted, it should be in Greg's tree. The relevant part goes
> like this:
> diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
> index f1ea3a3..3372faa 100644
> --- a/drivers/usb/serial/generic.c
> +++ b/drivers/usb/serial/generic.c
> @@ -386,12 +386,15 @@ int usb_serial_generic_chars_in_buffer(struct tty_struct *tty)
>
> dbg("%s - port %d", __func__, port->number);
>
> + spin_lock_irqsave(&port->lock, flags);
> if (serial->type->max_in_flight_urbs) {
> - spin_lock_irqsave(&port->lock, flags);
> chars = port->tx_bytes_flight;
> - spin_unlock_irqrestore(&port->lock, flags);
> - } else if (serial->num_bulk_out)
> - chars = kfifo_len(&port->write_fifo);
> + } else if (serial->num_bulk_out) {
> + /* This overcounts badly, but is good enough for drain wait. */
> + chars = __kfifo_len(port->write_fifo);
> + chars += port->write_urb_busy * port->bulk_out_size;
> + }
> + spin_unlock_irqrestore(&port->lock, flags);
>
> dbg("%s - returns %d", __func__, chars);
> return chars;
That is indeed what you submitted on Dec 7, but this is what is in
Greg's tree:
http://git.kernel.org/?p=linux/kernel/git/gregkh/patches.git;a=blob;f=usb/usb-serial-mct_usb232-add-drain-on-close.patch;h=c464f1a82e93df0dd41762a8cb33b0b22e90cdd7;hb=1ea72e7c40b239c6b6f88a4993196be66fc3d892
38 --- a/drivers/usb/serial/generic.c
39 +++ b/drivers/usb/serial/generic.c
40 @@ -369,8 +369,11 @@ int usb_serial_generic_write_room(struct
41 room = port->bulk_out_size *
42 (serial->type->max_in_flight_urbs -
43 port->urbs_in_flight);
44 - } else if (serial->num_bulk_out)
45 + } else if (serial->num_bulk_out) {
46 + /* This overcounts badly, but is good enough for drain wait. */
47 room = kfifo_avail(&port->write_fifo);
48 + room += port->write_urb_busy * port->bulk_out_size;
49 + }
50 spin_unlock_irqrestore(&port->lock, flags);
51
52 dbg("%s - returns %d", __func__, room);
Which does not make any sense at all. Bad merge? What do you say Greg?
/Johan
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