linux-kernel - [PATCH] iio: adc: max1027: allocate DMA-safe buffer

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Message-Id: <20161209102435.30638-1-marcus.folkesson@gmail.com>
Date:   Fri,  9 Dec 2016 11:24:35 +0100
From:   Marcus Folkesson <marcus.folkesson@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Matt Ranostay <mranostay@...il.com>,
        Sandhya Bankar <bankarsandhya512@...il.com>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Marcus Folkesson <marcus.folkesson@...il.com>
Subject: [PATCH] iio: adc: max1027: allocate DMA-safe buffer

The buffer needs to be DMA-safe when used with spi_read()

Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
---
 drivers/iio/adc/max1027.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
index 712fbd2b1f16..ff1f1f15a873 100644
--- a/drivers/iio/adc/max1027.c
+++ b/drivers/iio/adc/max1027.c
@@ -435,7 +435,7 @@ static int max1027_probe(struct spi_device *spi)
 
 	st->buffer = devm_kmalloc(&indio_dev->dev,
 				  indio_dev->num_channels * 2,
-				  GFP_KERNEL);
+				  GFP_KERNEL | GFP_DMA);
 	if (st->buffer == NULL) {
 		dev_err(&indio_dev->dev, "Can't allocate buffer\n");
 		return -ENOMEM;
-- 
2.11.0.rc2