This is a note to let you know that I've just added the patch titled iio: frequency: adf4350: Fix alignment for DMA safety to the 5.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: iio-frequency-adf4350-fix-alignment-for-dma-safety.patch and it can be found in the queue-5.18 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 90d0622efe419110b313e0c6dbdccd8f91196fe6 Author: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> Date: Sun May 8 18:56:46 2022 +0100 iio: frequency: adf4350: Fix alignment for DMA safety [ Upstream commit 389b8972eb2a614cb3189e5fa55b1b7f66142c71 ] ____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. Updated help text to 'may' require buffers to be in their own cacheline. Fixes: e31166f0fd48 ("iio: frequency: New driver for Analog Devices ADF4350/ADF4351 Wideband Synthesizers") Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> Acked-by: Nuno Sá <nuno.sa@xxxxxxxxxx> Link: https://lore.kernel.org/r/20220508175712.647246-67-jic23@xxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/iio/frequency/adf4350.c b/drivers/iio/frequency/adf4350.c index be1218d86291..85e289700c3c 100644 --- a/drivers/iio/frequency/adf4350.c +++ b/drivers/iio/frequency/adf4350.c @@ -56,10 +56,10 @@ struct adf4350_state { */ struct mutex lock; /* - * DMA (thus cache coherency maintenance) requires the - * transfer buffers to live in their own cache lines. + * DMA (thus cache coherency maintenance) may require that + * transfer buffers live in their own cache lines. */ - __be32 val ____cacheline_aligned; + __be32 val __aligned(IIO_DMA_MINALIGN); }; static struct adf4350_platform_data default_pdata = {