linux-kernel - [PATCH 5.18 0604/1095] iio: adc: hi8435: Fix alignment for DMA safety

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Message-Id: <20220815180454.524576584@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:00:03 +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 0604/1095] iio: adc: hi8435: Fix alignment for DMA safety

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

[ Upstream commit 48e4ae96b0b10f93de23b86fd34e573c44e95ab3 ]

____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: 72aa29ce0a59 ("iio: adc: hi8435: Holt HI-8435 threshold detector")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Acked-by: Nuno Sá <nuno.sa@...log.com>
Link: https://lore.kernel.org/r/20220508175712.647246-21-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/adc/hi8435.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/hi8435.c b/drivers/iio/adc/hi8435.c
index 8eb0140df133..771fa12bdc02 100644
--- a/drivers/iio/adc/hi8435.c
+++ b/drivers/iio/adc/hi8435.c
@@ -49,7 +49,7 @@ struct hi8435_priv {
 
 	unsigned threshold_lo[2]; /* GND-Open and Supply-Open thresholds */
 	unsigned threshold_hi[2]; /* GND-Open and Supply-Open thresholds */
-	u8 reg_buffer[3] ____cacheline_aligned;
+	u8 reg_buffer[3] __aligned(IIO_DMA_MINALIGN);
 };
 
 static int hi8435_readb(struct hi8435_priv *priv, u8 reg, u8 *val)
-- 
2.35.1