linux-kernel - [PATCH 5.18 0619/1095] iio: adc: ti-ads131e08: Fix alignment for DMA safety

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Date:   Mon, 15 Aug 2022 20:00:18 +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>,
        Tomislav Denis <tomislav.denis@....com>,
        Nuno Sá <nuno.sa@...log.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0619/1095] iio: adc: ti-ads131e08: Fix alignment for DMA safety

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

[ Upstream commit 55afdd050c063ae4b8dbd566107a030c00d005fd ]

____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: d935eddd2799 ("iio: adc: Add driver for Texas Instruments ADS131E0x ADC family")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Tomislav Denis <tomislav.denis@....com>
Acked-by: Nuno Sá <nuno.sa@...log.com>
Link: https://lore.kernel.org/r/20220508175712.647246-36-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/adc/ti-ads131e08.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ti-ads131e08.c b/drivers/iio/adc/ti-ads131e08.c
index 80a09817c119..32237cacc9a3 100644
--- a/drivers/iio/adc/ti-ads131e08.c
+++ b/drivers/iio/adc/ti-ads131e08.c
@@ -105,7 +105,7 @@ struct ads131e08_state {
 		s64 ts __aligned(8);
 	} tmp_buf;
 
-	u8 tx_buf[3] ____cacheline_aligned;
+	u8 tx_buf[3] __aligned(IIO_DMA_MINALIGN);
 	/*
 	 * Add extra one padding byte to be able to access the last channel
 	 * value using u32 pointer
-- 
2.35.1