From b990cdfe7536a8da7e134d516350402981300016 Mon Sep 17 00:00:00 2001
From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Date: Sun, 8 May 2022 18:55:49 +0100
Subject: [PATCH] iio: adc: ad7266: Fix alignment for DMA safety
Mime-version: 1.0
Content-type: text/plain; charset=UTF-8
Content-transfer-encoding: 8bit
Git-commit: b990cdfe7536a8da7e134d516350402981300016
Patch-mainline: v6.0-rc1
References: git-fixes
____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.
Update the comment to reflect that DMA safety 'may' require separate
cachelines.
Fixes: 54e018da3141 ("iio:ad7266: Mark transfer buffer as __be16")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-10-jic23@kernel.org
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/iio/adc/ad7266.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/adc/ad7266.c b/drivers/iio/adc/ad7266.c
index f20d39f0bc01..468c2656d2be 100644
--- a/drivers/iio/adc/ad7266.c
+++ b/drivers/iio/adc/ad7266.c
@@ -37,7 +37,7 @@ struct ad7266_state {
struct gpio_desc *gpios[3];
/*
- * DMA (thus cache coherency maintenance) requires the
+ * DMA (thus cache coherency maintenance) may require the
* transfer buffers to live in their own cache lines.
* The buffer needs to be large enough to hold two samples (4 bytes) and
* the naturally aligned timestamp (8 bytes).
@@ -45,7 +45,7 @@ struct ad7266_state {
struct {
__be16 sample[2];
s64 timestamp;
- } data ____cacheline_aligned;
+ } data __aligned(IIO_DMA_MINALIGN);
};
static int ad7266_wakeup(struct ad7266_state *st)
--
2.35.3