linux-kernel - Re: [PATCH] spi: dw: fix buffer end address

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Message-ID: <762bc63e-7b01-0d77-3939-7b236dbda37f@gmail.com>
Date:   Tue, 30 Oct 2018 01:35:15 +0900
From:   Jaewon Kim <jaewon02.kim@...il.com>
To:     Mark Brown <broonie@...nel.org>,
        Jaewon Kim <jaewon02.kim@...sung.com>
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi: dw: fix buffer end address

There is some side effect on this patch.

So, I revoke this patch.


18. 10. 25. 오전 12:37에 Jaewon Kim 이(가) 쓴 글:
> Buffer address can be NULL, if user does not want to receive TX/RX data.
> In this case, driver should not set the rx/tx_end value with len.
>
> Signed-off-by: Jaewon Kim <jaewon02.kim@...sung.com>
> ---
>   drivers/spi/spi-dw.c | 8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
> index b705f2b..34e6fca 100644
> --- a/drivers/spi/spi-dw.c
> +++ b/drivers/spi/spi-dw.c
> @@ -293,9 +293,13 @@ static int dw_spi_transfer_one(struct spi_controller *master,
>   	dws->dma_mapped = 0;
>   
>   	dws->tx = (void *)transfer->tx_buf;
> -	dws->tx_end = dws->tx + transfer->len;
> +	dws->tx_end = dws->tx;
> +	if (dws->tx)
> +		dws->tx_end += transfer->len;
>   	dws->rx = transfer->rx_buf;
> -	dws->rx_end = dws->rx + transfer->len;
> +	dws->rx_end = dws->rx;
> +	if (dws->rx)
> +		dws->rx_end += transfer->len;
>   	dws->len = transfer->len;
>   
>   	spi_enable_chip(dws, 0);