From 62fa19bf484bfeb52c56b7c6d6a6b1222c597f9c Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Sun, 8 May 2022 18:56:19 +0100 Subject: [PATCH] iio: adc: ti-tlc4541: Fix alignment for DMA safety MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit ____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: ac2bec9d587c ("iio: adc: tlc4541: add support for TI tlc4541 adc") Signed-off-by: Jonathan Cameron Acked-by: Nuno Sá Link: https://lore.kernel.org/r/20220508175712.647246-40-jic23@kernel.org --- drivers/iio/adc/ti-tlc4541.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/iio/adc/ti-tlc4541.c b/drivers/iio/adc/ti-tlc4541.c index 2406eda9dfc6..30f629a553a1 100644 --- a/drivers/iio/adc/ti-tlc4541.c +++ b/drivers/iio/adc/ti-tlc4541.c @@ -37,12 +37,12 @@ struct tlc4541_state { struct spi_message scan_single_msg; /* - * DMA (thus cache coherency maintenance) requires the + * DMA (thus cache coherency maintenance) may require the * transfer buffers to live in their own cache lines. * 2 bytes data + 6 bytes padding + 8 bytes timestamp when * call iio_push_to_buffers_with_timestamp. */ - __be16 rx_buf[8] ____cacheline_aligned; + __be16 rx_buf[8] __aligned(IIO_DMA_MINALIGN); }; struct tlc4541_chip_info {