On Mon, Feb 16, 2015 at 03:57:55PM +0800, Peter Hung wrote:
> The F81232 bulk-in is RX data + LSR channel, data format is
> [LSR+Data][LSR+Data]..... , We had reimplemented in this patch.
>
> Signed-off-by: Peter Hung <hpeter+linux_ker...@gmail.com>
> ---
> drivers/usb/serial/f81232.c | 68
> +++++++++++++++++++++++----------------------
> 1 file changed, 35 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
> index ec4609d..9ea498a 100644
> --- a/drivers/usb/serial/f81232.c
> +++ b/drivers/usb/serial/f81232.c
> @@ -185,44 +185,46 @@ exit:
> static void f81232_process_read_urb(struct urb *urb)
> {
> struct usb_serial_port *port = urb->context;
> - struct f81232_private *priv = usb_get_serial_port_data(port);
> unsigned char *data = urb->transfer_buffer;
> - char tty_flag = TTY_NORMAL;
> - unsigned long flags;
> - u8 line_status;
> + char tty_flag;
> int i;
>
> - /* update line status */
> - spin_lock_irqsave(&priv->lock, flags);
> - line_status = priv->modem_status;
> - priv->modem_status &= ~UART_STATE_TRANSIENT_MASK;
> - spin_unlock_irqrestore(&priv->lock, flags);
> -
> - if (!urb->actual_length)
> + if (urb->actual_length < 2)
> return;
>
> - /* break takes precedence over parity, */
> - /* which takes precedence over framing errors */
> - if (line_status & UART_BREAK_ERROR)
> - tty_flag = TTY_BREAK;
> - else if (line_status & UART_PARITY_ERROR)
> - tty_flag = TTY_PARITY;
> - else if (line_status & UART_FRAME_ERROR)
> - tty_flag = TTY_FRAME;
> - dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, tty_flag);
> -
> - /* overrun is special, not associated with a char */
> - if (line_status & UART_OVERRUN_ERROR)
> - tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
> -
> - if (port->port.console && port->sysrq) {
> - for (i = 0; i < urb->actual_length; ++i)
> - if (!usb_serial_handle_sysrq_char(port, data[i]))
> - tty_insert_flip_char(&port->port, data[i],
> - tty_flag);
> - } else {
> - tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
> - urb->actual_length);
> + /* bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]... */
> +
> + for (i = 0 ; i < urb->actual_length ; i += 2) {
> + tty_flag = TTY_NORMAL;
> +
> + if (unlikely(data[i+0] & UART_LSR_BRK_ERROR_BITS)) {
Never use unlikely() unless you can prove that it actually matters if
you use it. Hint, it's almost impossible to prove, so don't use it, the
compiler and processor look-ahead is almost smarter than we are.
thanks,
greg k-h
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