[PATCH 5.12 617/700] iio: magn: rm3100: Fix alignment of buffer in iio_push_to_buffers_with_timestamp()

[Greg Kroah-Hartman]

From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>

[ Upstream commit b8f939fd20690623cb24845a563e7bc1e4a21482 ]

Add __aligned(8) to ensure the buffer passed to
iio_push_to_buffers_with_timestamp() is suitable for the naturally
aligned timestamp that will be inserted.

Here an explicit structure is not used, because this buffer is used in
a non-trivial way for data repacking.

Fixes: 121354b2eceb ("iio: magnetometer: Add driver support for PNI RM3100")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Song Qiang <songqiang1304521@xxxxxxxxx>
Reviewed-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210613152301.571002-6-jic23@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/iio/magnetometer/rm3100-core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/magnetometer/rm3100-core.c b/drivers/iio/magnetometer/rm3100-core.c
index 7242897a05e9..720234a91db1 100644
--- a/drivers/iio/magnetometer/rm3100-core.c
+++ b/drivers/iio/magnetometer/rm3100-core.c
@@ -78,7 +78,8 @@ struct rm3100_data {
 	bool use_interrupt;
 	int conversion_time;
 	int scale;
-	u8 buffer[RM3100_SCAN_BYTES];
+	/* Ensure naturally aligned timestamp */
+	u8 buffer[RM3100_SCAN_BYTES] __aligned(8);
 	struct iio_trigger *drdy_trig;
 
 	/*
-- 
2.30.2