[PATCH 5.4 309/348] iio: adc: at91-sama5d2: Fix buffer alignment in iio_push_to_buffers_with_timestamp()

From: Greg Kroah-Hartman
Date: Mon Jul 12 2021 - 02:38:05 EST


From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>

[ Upstream commit 8f884758966259fa8c50c137ac6d4ce9bb7859db ]

To make code more readable, use a structure to express the channel
layout and ensure the timestamp is 8 byte aligned.

Found during an audit of all calls of this function.

Fixes: 5e1a1da0f8c9 ("iio: adc: at91-sama5d2_adc: add hw trigger and buffer support")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
Reviewed-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210613152301.571002-2-jic23@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/iio/adc/at91-sama5d2_adc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index bafb9dded0ea..def4abeb47ca 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -400,7 +400,8 @@ struct at91_adc_state {
struct at91_adc_dma dma_st;
struct at91_adc_touch touch_st;
struct iio_dev *indio_dev;
- u16 buffer[AT91_BUFFER_MAX_HWORDS];
+ /* Ensure naturally aligned timestamp */
+ u16 buffer[AT91_BUFFER_MAX_HWORDS] __aligned(8);
/*
* lock to prevent concurrent 'single conversion' requests through
* sysfs.
--
2.30.2