From: Jonathan Cameron Date: Sun, 8 May 2022 17:56:02 +0000 (+0100) Subject: iio: adc: ltc2497: Fix alignment for DMA safety X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6ebf401d555ee1e75e779b865d38e171db0aa1f2;p=linux.git iio: adc: ltc2497: Fix alignment for DMA safety ____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: bc82222fcca1 ("iio:adc: Driver for Linear Technology LTC2497 ADC") Signed-off-by: Jonathan Cameron Cc: Michael Hennerich Acked-by: Nuno Sá Link: https://lore.kernel.org/r/20220508175712.647246-23-jic23@kernel.org --- diff --git a/drivers/iio/adc/ltc2497.c b/drivers/iio/adc/ltc2497.c index 1adddf5a88a94..f7c786f37ceb1 100644 --- a/drivers/iio/adc/ltc2497.c +++ b/drivers/iio/adc/ltc2497.c @@ -20,10 +20,10 @@ struct ltc2497_driverdata { struct ltc2497core_driverdata common_ddata; struct i2c_client *client; /* - * DMA (thus cache coherency maintenance) requires the + * DMA (thus cache coherency maintenance) may require the * transfer buffers to live in their own cache lines. */ - __be32 buf ____cacheline_aligned; + __be32 buf __aligned(IIO_DMA_MINALIGN); }; static int ltc2497_result_and_measure(struct ltc2497core_driverdata *ddata,