From: Jonathan Cameron Date: Sun, 8 May 2022 17:56:21 +0000 (+0100) Subject: iio: amplifiers: ad8366: Fix alignment for DMA safety X-Git-Tag: v5.18.18~472 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ae4801a073205b1e9c8d03e36ce3dc216183b44e;p=thirdparty%2Fkernel%2Fstable.git iio: amplifiers: ad8366: Fix alignment for DMA safety [ Upstream commit 026bffa458d029a5f15ac3f82a9bb0f64aca403d ] ____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. Update the comment to include 'may'. Fixes: e71d42e03c60 ("iio: amplifiers: New driver for AD8366 Dual-Digital Variable Gain Amplifier") Signed-off-by: Jonathan Cameron Acked-by: Nuno Sá Link: https://lore.kernel.org/r/20220508175712.647246-42-jic23@kernel.org Signed-off-by: Sasha Levin --- diff --git a/drivers/iio/amplifiers/ad8366.c b/drivers/iio/amplifiers/ad8366.c index 1134ae12e5319..f2c2ea79a07f3 100644 --- a/drivers/iio/amplifiers/ad8366.c +++ b/drivers/iio/amplifiers/ad8366.c @@ -45,10 +45,10 @@ struct ad8366_state { enum ad8366_type type; struct ad8366_info *info; /* - * DMA (thus cache coherency maintenance) requires the + * DMA (thus cache coherency maintenance) may require the * transfer buffers to live in their own cache lines. */ - unsigned char data[2] ____cacheline_aligned; + unsigned char data[2] __aligned(IIO_DMA_MINALIGN); }; static struct ad8366_info ad8366_infos[] = {