[PATCH 5.19 0671/1157] iio: common: ssp: Fix alignment for DMA safety

Greg Kroah-Hartman
2022-08-16T00:14:19Z

From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

[ Upstream commit 314d2b1978bb3d20b1ec239f4e28c394da493f36 ]

____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: 50dd64d57eee ("iio: common: ssp_sensors: Add sensorhub driver")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-43-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iio/common/ssp_sensors/ssp.h | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/iio/common/ssp_sensors/ssp.h b/drivers/iio/common/ssp_sensors/ssp.h
index abb832795619..f649cdecc277 100644
--- a/drivers/iio/common/ssp_sensors/ssp.h
+++ b/drivers/iio/common/ssp_sensors/ssp.h
@@ -221,8 +221,7 @@ struct ssp_data {
struct iio_dev *sensor_devs[SSP_SENSOR_MAX];
atomic_t enable_refcount;

- __le16 header_buffer[SSP_HEADER_BUFFER_SIZE / sizeof(__le16)]
- ____cacheline_aligned;
+ __le16 header_buffer[SSP_HEADER_BUFFER_SIZE / sizeof(__le16)] __aligned(IIO_DMA_MINALIGN);
};

void ssp_clean_pending_list(struct ssp_data *data);
--
2.35.1