linux-kernel - [PATCH 5.18 0594/1095] iio: adc: ad7280a: Fix alignment for DMA safety

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Date:   Mon, 15 Aug 2022 19:59:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0594/1095] iio: adc: ad7280a: Fix alignment for DMA safety

From: Jonathan Cameron <Jonathan.Cameron@...wei.com>

[ Upstream commit 4e2008429588b857bbc13d048b67b931a8d84816 ]

____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: 003f1d48de52 ("staging:iio:adc:ad7280a: Split buff[2] into tx and rx parts")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Acked-by: Nuno Sá <nuno.sa@...log.com>
Link: https://lore.kernel.org/r/20220508175712.647246-11-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/adc/ad7280a.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ad7280a.c b/drivers/iio/adc/ad7280a.c
index ec9acbf12b9a..047a9d0dbcf7 100644
--- a/drivers/iio/adc/ad7280a.c
+++ b/drivers/iio/adc/ad7280a.c
@@ -183,7 +183,7 @@ struct ad7280_state {
 	unsigned char			cb_mask[AD7280A_MAX_CHAIN];
 	struct mutex			lock; /* protect sensor state */
 
-	__be32				tx ____cacheline_aligned;
+	__be32				tx __aligned(IIO_DMA_MINALIGN);
 	__be32				rx;
 };
 
-- 
2.35.1