linux-kernel - Re: [PATCH 04/44] serial: pch_uart: Use uart_xmit

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Message-ID: <Y0/bTtsR2gqVa8/t@smile.fi.intel.com>
Date:   Wed, 19 Oct 2022 14:11:10 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     linux-serial@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/44] serial: pch_uart: Use uart_xmit_advance()

On Wed, Oct 19, 2022 at 12:11:11PM +0300, Ilpo Järvinen wrote:
> Take advantage of the new uart_xmit_advance() helper.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> ---
>  drivers/tty/serial/pch_uart.c | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
> index c59ce7886579..c76719c0f453 100644
> --- a/drivers/tty/serial/pch_uart.c
> +++ b/drivers/tty/serial/pch_uart.c
> @@ -738,15 +738,12 @@ static void pch_dma_tx_complete(void *arg)
>  {
>  	struct eg20t_port *priv = arg;
>  	struct uart_port *port = &priv->port;
> -	struct circ_buf *xmit = &port->state->xmit;
>  	struct scatterlist *sg = priv->sg_tx_p;
>  	int i;
>  
> -	for (i = 0; i < priv->nent; i++, sg++) {
> -		xmit->tail += sg_dma_len(sg);
> -		port->icount.tx += sg_dma_len(sg);
> -	}
> -	xmit->tail &= UART_XMIT_SIZE - 1;
> +	for (i = 0; i < priv->nent; i++, sg++)
> +		uart_xmit_advance(port, sg_dma_len(sg));
> +
>  	async_tx_ack(priv->desc_tx);
>  	dma_unmap_sg(port->dev, sg, priv->orig_nent, DMA_TO_DEVICE);
>  	priv->tx_dma_use = 0;
> @@ -843,8 +840,7 @@ static unsigned int handle_tx(struct eg20t_port *priv)
>  
>  	while (!uart_tx_stopped(port) && !uart_circ_empty(xmit) && fifo_size) {
>  		iowrite8(xmit->buf[xmit->tail], priv->membase + PCH_UART_THR);
> -		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
> -		port->icount.tx++;
> +		uart_xmit_advance(port, 1);
>  		fifo_size--;
>  		tx_empty = 0;
>  	}
> -- 
> 2.30.2
> 

-- 
With Best Regards,
Andy Shevchenko