linux-kernel - Re: [PATCH v5 1/7] tty: serial: imx: correct dma cookie status

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Message-ID: <20180629110346.GD22377@vkoul-mobl>
Date:   Fri, 29 Jun 2018 16:33:46 +0530
From:   Vinod <vkoul@...nel.org>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Robin Gong <yibin.gong@....com>, s.hauer@...gutronix.de,
        l.stach@...gutronix.de, dan.j.williams@...el.com,
        gregkh@...uxfoundation.org, jslaby@...e.com,
        dmaengine@...r.kernel.org, linux-imx@....com,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 1/7] tty: serial: imx: correct dma cookie status

On 26-06-18, 21:22, Uwe Kleine-König wrote:
> On Wed, Jun 20, 2018 at 12:56:58AM +0800, Robin Gong wrote:
> > Correct to check the right rx dma cookie status in spit of it
> > works because only one cookie is running in the current sdma.
> > But it will not once sdma driver support multi cookies
> > running based on virt-dma.
> > 
> > Signed-off-by: Robin Gong <yibin.gong@....com>
> Looks wrong (because of tx_status vs rx_cookie), but is right
> nevertheless I think:

hehe, tx refers to transfer status for rx (receive) cookie and not
transmit .. yeah notations can be better!

> 
> Acked-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> 
> Thanks
> Uwe
> 
> > ---
> >  drivers/tty/serial/imx.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
> > index 4e85357..2879407 100644
> > --- a/drivers/tty/serial/imx.c
> > +++ b/drivers/tty/serial/imx.c
> > @@ -1051,7 +1051,7 @@ static void imx_uart_dma_rx_callback(void *data)
> >  	unsigned int r_bytes;
> >  	unsigned int bd_size;
> >  
> > -	status = dmaengine_tx_status(chan, (dma_cookie_t)0, &state);
> > +	status = dmaengine_tx_status(chan, sport->rx_cookie, &state);
> >  
> >  	if (status == DMA_ERROR) {
> >  		imx_uart_clear_rx_errors(sport);
> > -- 
> > 2.7.4
> > 
> > 
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> > 
> 
> -- 
> Pengutronix e.K.                           | Uwe Kleine-König            |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |

-- 
~Vinod

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