From: Jonathan Cameron Date: Sun, 8 May 2022 17:57:10 +0000 (+0100) Subject: iio: temp: ltc2983: Fix alignment for DMA safety X-Git-Tag: v5.18.18~425 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=117a711a86f50e3c7b366826f715f64cb5bd7bf7;p=thirdparty%2Fkernel%2Fstable.git iio: temp: ltc2983: Fix alignment for DMA safety [ Upstream commit 732f2cb2fbb51bd5bc03a114bd102ab3b2f537fe ] ____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: f110f3188e56 ("iio: temperature: Add support for LTC2983") Signed-off-by: Jonathan Cameron Acked-by: Nuno Sá Link: https://lore.kernel.org/r/20220508175712.647246-91-jic23@kernel.org Signed-off-by: Sasha Levin --- diff --git a/drivers/iio/temperature/ltc2983.c b/drivers/iio/temperature/ltc2983.c index 301c3f13fb26c..1b8252d86889e 100644 --- a/drivers/iio/temperature/ltc2983.c +++ b/drivers/iio/temperature/ltc2983.c @@ -200,11 +200,11 @@ struct ltc2983_data { u8 num_channels; u8 iio_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. * Holds the converted temperature */ - __be32 temp ____cacheline_aligned; + __be32 temp __aligned(IIO_DMA_MINALIGN); }; struct ltc2983_sensor {