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[46/92] iio: dac: ad5449: Fix alignment for DMA safety

Message ID 20220503085935.1533814-47-jic23@kernel.org (mailing list archive)
State Superseded
Headers show
Series IIO: Fix alignment of buffers for DMA | expand

Commit Message

Jonathan Cameron May 3, 2022, 8:58 a.m. UTC 
From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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

Update the comment to include 'may'.

Fixes: 8341dc04dfb3 ("iio:dac: Add support for the ad5449")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
---
 drivers/iio/dac/ad5449.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/iio/dac/ad5449.c b/drivers/iio/dac/ad5449.c
index bad9bdaafa94..87307484bd7a 100644
--- a/drivers/iio/dac/ad5449.c
+++ b/drivers/iio/dac/ad5449.c
@@ -68,10 +68,10 @@  struct ad5449 {
 	uint16_t dac_cache[AD5449_MAX_CHANNELS];
 
 	/*
-	 * DMA (thus cache coherency maintenance) requires the
+	 * DMA (thus cache coherency maintenance) may require the
 	 * transfer buffers to live in their own cache lines.
 	 */
-	__be16 data[2] ____cacheline_aligned;
+	__be16 data[2] __aligned(IIO_ALIGN);
 };
 
 enum ad5449_type {