linux-kernel - Re: [PATCH 4.4 071/101] spi: davinci: use dma_mapping

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Date:   Wed, 05 Jul 2017 15:24:37 +0100
From:   Ben Hutchings <ben.hutchings@...ethink.co.uk>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Kevin Hilman <khilman@...libre.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: Re: [PATCH 4.4 071/101] spi: davinci: use dma_mapping_error()

On Mon, 2017-07-03 at 15:35 +0200, Greg Kroah-Hartman wrote:
> 4.4-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Kevin Hilman <khilman@...libre.com>
> 
> 
> [ Upstream commit c5a2a394835f473ae23931eda5066d3771d7b2f8 ]
> 
> The correct error checking for dma_map_single() is to use
> dma_mapping_error().
> 
> Signed-off-by: Kevin Hilman <khilman@...libre.com>
> Signed-off-by: Mark Brown <broonie@...nel.org>
> Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/spi/spi-davinci.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> --- a/drivers/spi/spi-davinci.c
> +++ b/drivers/spi/spi-davinci.c
> @@ -651,7 +651,7 @@ static int davinci_spi_bufs(struct spi_d
>  			buf = t->rx_buf;
>  		t->rx_dma = dma_map_single(&spi->dev, buf,
>  				t->len, DMA_FROM_DEVICE);
> -		if (!t->rx_dma) {
> +		if (dma_mapping_error(&spi->dev, !t->rx_dma)) {
[...]

The '!' needs to be deleted.  This appears to have been fixed upstream
by:

commit 8aedbf580d21121d2a032e4c8ea12d8d2d85e275
Author: Fabien Parent <fparent@...libre.com>
Date:   Thu Feb 23 19:01:56 2017 +0100

    spi: davinci: Use SPI framework to handle DMA mapping

which is not suitable for stable.

Ben.

-- 
Ben Hutchings
Software Developer, Codethink Ltd.