linux-kernel - [PATCH 5.18 0646/1095] iio: dac: ti-dac5571: Fix alignment for DMA safety

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Date:   Mon, 15 Aug 2022 20:00:45 +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>,
        Sean Nyekjaer <sean.nyekjaer@...vas.dk>,
        Nuno Sá <nuno.sa@...log.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0646/1095] iio: dac: ti-dac5571: Fix alignment for DMA safety

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

[ Upstream commit 58e22371539e01c742be5c30295f591a6a17e348 ]

____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: df38a4a72a3b ("iio: dac: add TI DAC5571 family support")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Sean Nyekjaer <sean.nyekjaer@...vas.dk>
Acked-by: Nuno Sá <nuno.sa@...log.com>
Link: https://lore.kernel.org/r/20220508175712.647246-63-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/dac/ti-dac5571.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/dac/ti-dac5571.c b/drivers/iio/dac/ti-dac5571.c
index 0b775f943db3..ba68ea1e3455 100644
--- a/drivers/iio/dac/ti-dac5571.c
+++ b/drivers/iio/dac/ti-dac5571.c
@@ -52,7 +52,7 @@ struct dac5571_data {
 	struct dac5571_spec const *spec;
 	int (*dac5571_cmd)(struct dac5571_data *data, int channel, u16 val);
 	int (*dac5571_pwrdwn)(struct dac5571_data *data, int channel, u8 pwrdwn);
-	u8 buf[3] ____cacheline_aligned;
+	u8 buf[3] __aligned(IIO_DMA_MINALIGN);
 };
 
 #define DAC5571_POWERDOWN(mode)		((mode) + 1)
-- 
2.35.1