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USB: io_ti: query hardware-buffer status in chars_in_buffer
Query hardware-buffer status in chars_in_buffer should the write fifo be empty. This is needed to make the tty layer wait for hardware buffers to drain on close. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 7 additions and 0 deletions
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@ -2088,6 +2088,7 @@ static int edge_chars_in_buffer(struct tty_struct *tty)
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struct edgeport_port *edge_port = usb_get_serial_port_data(port);
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int chars = 0;
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unsigned long flags;
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int ret;
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if (edge_port == NULL)
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return 0;
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@ -2098,6 +2099,12 @@ static int edge_chars_in_buffer(struct tty_struct *tty)
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chars = kfifo_len(&edge_port->write_fifo);
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spin_unlock_irqrestore(&edge_port->ep_lock, flags);
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if (!chars) {
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ret = tx_active(edge_port);
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if (ret > 0)
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chars = ret;
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}
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dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
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return chars;
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}
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