linux-kernel - Re: [PATCH v2] mmc: sdhci: fix an issue of mixing different types

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Date:   Mon, 20 Jan 2020 09:14:08 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Chunyan Zhang <zhang.lyra@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Faiz Abbas <faiz_abbas@...com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Chunyan Zhang <zhang.chunyan@...aro.org>,
        linux-mmc@...r.kernel.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, kbuild test robot <lkp@...el.com>
Subject: Re: [PATCH v2] mmc: sdhci: fix an issue of mixing different types

On 20/01/20 5:32 am, Chunyan Zhang wrote:
> Fix an issue reported by sparse, since mixed types of parameters are
> used on calling dmaengine_prep_slave_sg().
> 
> Fixes: 36e1da441fec (mmc: sdhci: add support for using external DMA devices)

That commit number is only in next

> Reported-by: kbuild test robot <lkp@...el.com>
> Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
> Reviewed-by: Nathan Chancellor <natechancellor@...il.com>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
> Changes from v1:
> * address comments from Nathan Chancellor
> - define a new variable to avoid type conversions.
> ---
>  drivers/mmc/host/sdhci.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 30b5a624b50e..f9e0b5f2c692 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1201,6 +1201,7 @@ static int sdhci_external_dma_setup(struct sdhci_host *host,
>  				    struct mmc_command *cmd)
>  {
>  	int ret, i;
> +	enum dma_transfer_direction dir;
>  	struct dma_async_tx_descriptor *desc;
>  	struct mmc_data *data = cmd->data;
>  	struct dma_chan *chan;
> @@ -1234,8 +1235,8 @@ static int sdhci_external_dma_setup(struct sdhci_host *host,
>  	if (sg_cnt <= 0)
>  		return -EINVAL;
>  
> -	desc = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len,
> -				       mmc_get_dma_dir(data),
> +	dir = data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
> +	desc = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len, dir,
>  				       DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
>  	if (!desc)
>  		return -EINVAL;
>