[PATCH v2 80/92] iio: potentiometer: ad5110: Fix alignment for DMA safety

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>

____cacheline_aligned is an insufficient guarantee for non-coherent DMA
on platforms with 128 byte cachelines above L1.  Switch to the updated
IIO_DMA_MINALIGN definition.

Fixes: d03a74bfacce ("iio: potentiometer: Add driver support for AD5110")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Mugilraj Dhavachelvan <dmugil2000@xxxxxxxxx>
Acked-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
---
 drivers/iio/potentiometer/ad5110.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/potentiometer/ad5110.c b/drivers/iio/potentiometer/ad5110.c
index d4eeedae56e5..8fbcce482989 100644
--- a/drivers/iio/potentiometer/ad5110.c
+++ b/drivers/iio/potentiometer/ad5110.c
@@ -63,10 +63,10 @@ struct ad5110_data {
 	struct mutex            lock;
 	const struct ad5110_cfg	*cfg;
 	/*
-	 * DMA (thus cache coherency maintenance) requires the
+	 * DMA (thus cache coherency maintenance) may require the
 	 * transfer buffers to live in their own cache lines.
 	 */
-	u8			buf[2] ____cacheline_aligned;
+	u8			buf[2] __aligned(IIO_DMA_MINALIGN);
 };
 
 static const struct iio_chan_spec ad5110_channels[] = {
-- 
2.36.0




[Index of Archives]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Input]     [Linux Kernel]     [Linux SCSI]     [X.org]

  Powered by Linux