linux-kernel - [PATCH 5.18 0644/1095] iio: dac: mcp4922: Fix alignment for DMA safety

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Message-Id: <20220815180456.044796888@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:00:43 +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>,
        Michael Welling <mwelling@...e.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0644/1095] iio: dac: mcp4922: Fix alignment for DMA safety

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

[ Upstream commit e66bf04797f1f95a2402414c00e64d00f63d31ec ]

____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: 1b791fadf3a1 ("iio: dac: mcp4902/mcp4912/mcp4922 dac driver")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Acked-by: Nuno Sá <nuno.sa@...log.com>
Acked-by: Michael Welling <mwelling@...e.org>
Link: https://lore.kernel.org/r/20220508175712.647246-61-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/dac/mcp4922.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/dac/mcp4922.c b/drivers/iio/dac/mcp4922.c
index cb9e60e71b91..6c0e31032c57 100644
--- a/drivers/iio/dac/mcp4922.c
+++ b/drivers/iio/dac/mcp4922.c
@@ -29,7 +29,7 @@ struct mcp4922_state {
 	unsigned int value[MCP4922_NUM_CHANNELS];
 	unsigned int vref_mv;
 	struct regulator *vref_reg;
-	u8 mosi[2] ____cacheline_aligned;
+	u8 mosi[2] __aligned(IIO_DMA_MINALIGN);
 };
 
 #define MCP4922_CHAN(chan, bits) {			\
-- 
2.35.1