From 8dea228b174ac9637b567e5ef54f4c40db4b3c41 Mon Sep 17 00:00:00 2001
From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Date: Sat, 1 May 2021 18:13:47 +0100
Subject: [PATCH] iio: cros_ec_sensors: Fix alignment of buffer in
 iio_push_to_buffers_with_timestamp()

The samples buffer is passed to iio_push_to_buffers_with_timestamp()
which requires a buffer aligned to 8 bytes as it is assumed that
the timestamp will be naturally aligned if present.

Fixes tag is inaccurate but prior to that likely manual backporting needed
(for anything before 4.18) Earlier than that the include file to fix is
drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.h:
commit 974e6f02e27 ("iio: cros_ec_sensors_core: Add common functions
for the ChromeOS EC Sensor Hub.") present since kernel stable 4.10.
(Thanks to Gwendal for tracking this down)

Fixes: 5a0b8cb46624c ("iio: cros_ec: Move cros_ec_sensors_core.h in /include")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org
Link: https://lore.kernel.org/r/20210501171352.512953-7-jic23@kernel.org
---
 include/linux/iio/common/cros_ec_sensors_core.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h
index 7ce8a8adad58..c582e1a14232 100644
--- a/include/linux/iio/common/cros_ec_sensors_core.h
+++ b/include/linux/iio/common/cros_ec_sensors_core.h
@@ -77,7 +77,7 @@ struct cros_ec_sensors_core_state {
 		u16 scale;
 	} calib[CROS_EC_SENSOR_MAX_AXIS];
 	s8 sign[CROS_EC_SENSOR_MAX_AXIS];
-	u8 samples[CROS_EC_SAMPLE_SIZE];
+	u8 samples[CROS_EC_SAMPLE_SIZE] __aligned(8);
 
 	int (*read_ec_sensors_data)(struct iio_dev *indio_dev,
 				    unsigned long scan_mask, s16 *data);