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

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Message-Id: <20200120033223.897-1-zhang.chunyan@linaro.org>
Date:   Mon, 20 Jan 2020 11:32:23 +0800
From:   Chunyan Zhang <zhang.lyra@...il.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>
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, Chunyan Zhang <zhang.lyra@...il.com>,
        kbuild test robot <lkp@...el.com>
Subject: [PATCH v2] mmc: sdhci: fix an issue of mixing different types

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)
Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
Reviewed-by: Nathan Chancellor <natechancellor@...il.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;
-- 
2.20.1