From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Date: Sun, 8 May 2022 17:57:12 +0000 (+0100)
Subject: iio: temp: maxim_thermocouple: Fix alignment for DMA safety
X-Git-Tag: v5.18.18~423
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a842642de456b39eaaac258208e266521f1cd6e1;p=thirdparty%2Fkernel%2Fstable.git

iio: temp: maxim_thermocouple: Fix alignment for DMA safety

[ Upstream commit 10897f34309b3c7bc14698407436c82d11c07f47 ]

____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: 1f25ca11d84a ("iio: temperature: add support for Maxim thermocouple chips")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Matt Ranostay <mranostay@gmail.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-93-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/iio/temperature/maxim_thermocouple.c b/drivers/iio/temperature/maxim_thermocouple.c
index 98c41cddc6f00..c28a7a6dea5f1 100644
--- a/drivers/iio/temperature/maxim_thermocouple.c
+++ b/drivers/iio/temperature/maxim_thermocouple.c
@@ -122,7 +122,7 @@ struct maxim_thermocouple_data {
 	struct spi_device *spi;
 	const struct maxim_thermocouple_chip *chip;
 
-	u8 buffer[16] ____cacheline_aligned;
+	u8 buffer[16] __aligned(IIO_DMA_MINALIGN);
 	char tc_type;
 };