linux-kernel - [PATCH] spi: pic32: Use proper enum in dmaengine_prep_slave

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Message-Id: <20180920231337.24603-1-natechancellor@gmail.com>
Date:   Thu, 20 Sep 2018 16:13:37 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH] spi: pic32: Use proper enum in dmaengine_prep_slave_rg

Clang warns when one enumerated type is converted implicitly to another:

drivers/spi/spi-pic32.c:323:8: warning: implicit conversion from
enumeration type 'enum dma_data_direction' to different enumeration type
'enum dma_transfer_direction' [-Wenum-conversion]
                                          DMA_FROM_DEVICE,
                                          ^~~~~~~~~~~~~~~
drivers/spi/spi-pic32.c:333:8: warning: implicit conversion from
enumeration type 'enum dma_data_direction' to different enumeration type
'enum dma_transfer_direction' [-Wenum-conversion]
                                          DMA_TO_DEVICE,
                                          ^~~~~~~~~~~~~
2 warnings generated.

Use the proper enums from dma_transfer_direction (DMA_FROM_DEVICE =
DMA_DEV_TO_MEM = 2, DMA_TO_DEVICE = DMA_MEM_TO_DEV = 1) to satify Clang.

Link: https://github.com/ClangBuiltLinux/linux/issues/159
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---
 drivers/spi/spi-pic32.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-pic32.c b/drivers/spi/spi-pic32.c
index 46ff76193ee1..131849adc570 100644
--- a/drivers/spi/spi-pic32.c
+++ b/drivers/spi/spi-pic32.c
@@ -320,7 +320,7 @@ static int pic32_spi_dma_transfer(struct pic32_spi *pic32s,
 	desc_rx = dmaengine_prep_slave_sg(master->dma_rx,
 					  xfer->rx_sg.sgl,
 					  xfer->rx_sg.nents,
-					  DMA_FROM_DEVICE,
+					  DMA_DEV_TO_MEM,
 					  DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 	if (!desc_rx) {
 		ret = -EINVAL;
@@ -330,7 +330,7 @@ static int pic32_spi_dma_transfer(struct pic32_spi *pic32s,
 	desc_tx = dmaengine_prep_slave_sg(master->dma_tx,
 					  xfer->tx_sg.sgl,
 					  xfer->tx_sg.nents,
-					  DMA_TO_DEVICE,
+					  DMA_MEM_TO_DEV,
 					  DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 	if (!desc_tx) {
 		ret = -EINVAL;
-- 
2.19.0