linux-kernel - [PATCH 5.19 0658/1157] iio: adc: ti-adc084s021: Fix alignment for DMA safety

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Date:   Mon, 15 Aug 2022 20:00:14 +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>,
        Mårten Lindahl <marten.lindahl@...s.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 0658/1157] iio: adc: ti-adc084s021: Fix alignment for DMA safety

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

[ Upstream commit bb102fd600d1d6c0020a4514197c0604c4a218d9 ]

____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: 3691e5a69449 ("iio: adc: add driver for the ti-adc084s021 chip")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Acked-by: Nuno Sá <nuno.sa@...log.com>
Acked-by: Mårten Lindahl <marten.lindahl@...s.com>
Link: https://lore.kernel.org/r/20220508175712.647246-30-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/adc/ti-adc084s021.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/ti-adc084s021.c b/drivers/iio/adc/ti-adc084s021.c
index c9b5d9aec3dc..1f6e53832e06 100644
--- a/drivers/iio/adc/ti-adc084s021.c
+++ b/drivers/iio/adc/ti-adc084s021.c
@@ -32,10 +32,10 @@ struct adc084s021 {
 		s64 ts __aligned(8);
 	} scan;
 	/*
-	 * DMA (thus cache coherency maintenance) requires the
+	 * DMA (thus cache coherency maintenance) may require the
 	 * transfer buffers to live in their own cache line.
 	 */
-	u16 tx_buf[4] ____cacheline_aligned;
+	u16 tx_buf[4] __aligned(IIO_DMA_MINALIGN);
 	__be16 rx_buf[5]; /* First 16-bits are trash */
 };
 
-- 
2.35.1