linux-kernel - [PATCH 5.19 0666/1157] iio: adc: ti-ads8344: Fix alignment for DMA safety

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Message-Id: <20220815180506.363548723@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:00:22 +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 5.19 0666/1157] iio: adc: ti-ads8344: Fix alignment for DMA safety

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

[ Upstream commit 8966b11e5a14aaabc747ee97a7942fd50a681402 ]

____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: 8dd2d7c0fed7 ("iio: adc: Add driver for the TI ADS8344 A/DC chips")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Acked-by: Nuno Sá <nuno.sa@...log.com>
Link: https://lore.kernel.org/r/20220508175712.647246-38-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/adc/ti-ads8344.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ti-ads8344.c b/drivers/iio/adc/ti-ads8344.c
index c96d2a9ba924..bbd85cb47f81 100644
--- a/drivers/iio/adc/ti-ads8344.c
+++ b/drivers/iio/adc/ti-ads8344.c
@@ -28,7 +28,7 @@ struct ads8344 {
 	 */
 	struct mutex lock;
 
-	u8 tx_buf ____cacheline_aligned;
+	u8 tx_buf __aligned(IIO_DMA_MINALIGN);
 	u8 rx_buf[3];
 };
 
-- 
2.35.1