From: Jonathan Cameron Date: Sun, 8 May 2022 17:57:04 +0000 (+0100) Subject: iio: potentiometer: mcp4131: Fix alignment for DMA safety X-Git-Tag: v5.18.18~429 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=333b2fe814cd425da87a1919740254c32da7d1c3;p=thirdparty%2Fkernel%2Fstable.git iio: potentiometer: mcp4131: Fix alignment for DMA safety [ Upstream commit 4842e5de6f39ebf2c0f6da9e6a0cb751c7108507 ] ____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: 22d199a53910 ("iio: potentiometer: add driver for Microchip MCP413X/414X/415X/416X/423X/424X/425X/426X") Signed-off-by: Jonathan Cameron Acked-by: Nuno Sá Link: https://lore.kernel.org/r/20220508175712.647246-85-jic23@kernel.org Signed-off-by: Sasha Levin --- diff --git a/drivers/iio/potentiometer/mcp4131.c b/drivers/iio/potentiometer/mcp4131.c index 7c8c18ab87649..7890c0993ec48 100644 --- a/drivers/iio/potentiometer/mcp4131.c +++ b/drivers/iio/potentiometer/mcp4131.c @@ -129,7 +129,7 @@ struct mcp4131_data { struct spi_device *spi; const struct mcp4131_cfg *cfg; struct mutex lock; - u8 buf[2] ____cacheline_aligned; + u8 buf[2] __aligned(IIO_DMA_MINALIGN); }; #define MCP4131_CHANNEL(ch) { \