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[27/92] iio: adc: mcp320x: Fix alignment for DMA safety

Message ID 20220503085935.1533814-28-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State Superseded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.

Worth noting the fixes tag refers to the same issue being observed
on a platform that probably had only 64 byte cachelines.

Fixes: 0e81bc99a082 ("iio: mcp320x: Fix occasional incorrect readings")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Michael Welling <mwelling@ieee.org>
---
 drivers/iio/adc/mcp320x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/iio/adc/mcp320x.c b/drivers/iio/adc/mcp320x.c
index b4c69acb33e3..bd3ef543cc5d 100644
--- a/drivers/iio/adc/mcp320x.c
+++ b/drivers/iio/adc/mcp320x.c
@@ -92,7 +92,7 @@  struct mcp320x {
 	struct mutex lock;
 	const struct mcp320x_chip_info *chip_info;
 
-	u8 tx_buf ____cacheline_aligned;
+	u8 tx_buf __aligned(IIO_ALIGN);
 	u8 rx_buf[4];
 };