From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Date: Sun, 8 May 2022 17:56:41 +0000 (+0100)
Subject: iio: dac: ti-dac082s085: Fix alignment for DMA safety
X-Git-Tag: v5.18.18~452
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6c3dadea4bcdfff354fa43b1057fbb3a0bce8a26;p=thirdparty%2Fkernel%2Fstable.git

iio: dac: ti-dac082s085: Fix alignment for DMA safety

[ Upstream commit 03a0cc77f164e4e59b970d50c6e9a6caf06dae80 ]

____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: 61011264c1af ("iio: dac: Add Texas Instruments 8/10/12-bit 2/4-channel DAC driver")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-62-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/iio/dac/ti-dac082s085.c b/drivers/iio/dac/ti-dac082s085.c
index 4e1156e6deb2d..f52ad8fa77474 100644
--- a/drivers/iio/dac/ti-dac082s085.c
+++ b/drivers/iio/dac/ti-dac082s085.c
@@ -55,7 +55,7 @@ struct ti_dac_chip {
 	bool powerdown;
 	u8 powerdown_mode;
 	u8 resolution;
-	u8 buf[2] ____cacheline_aligned;
+	u8 buf[2] __aligned(IIO_DMA_MINALIGN);
 };
 
 #define WRITE_NOT_UPDATE(chan)	(0x00 | (chan) << 6)