From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Date: Sun, 8 May 2022 17:56:06 +0000 (+0100)
Subject: iio: adc: max1241: Fix alignment for DMA safety
X-Git-Tag: v5.18.18~487
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a6ea563de253982bc676100812e93710f8c25126;p=thirdparty%2Fkernel%2Fstable.git

iio: adc: max1241: Fix alignment for DMA safety

[ Upstream commit 9d7019e43ee67a48cef63f8f23f002233064d390 ]

____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: 8a80a71d9020 ("iio: adc: Add MAX1241 driver")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Alexandru Lazar <alazar@startmail.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-27-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/iio/adc/max1241.c b/drivers/iio/adc/max1241.c
index a5afd84af58b9..a815ad1f6913b 100644
--- a/drivers/iio/adc/max1241.c
+++ b/drivers/iio/adc/max1241.c
@@ -26,7 +26,7 @@ struct max1241 {
 	struct regulator *vref;
 	struct gpio_desc *shutdown;
 
-	__be16 data ____cacheline_aligned;
+	__be16 data __aligned(IIO_DMA_MINALIGN);
 };
 
 static const struct iio_chan_spec max1241_channels[] = {