[PATCH 6.6.y 1/2] iio: imu: inv_icm42600: reorganize DMA aligned buffers in structure

[Sasha Levin <sashal@kernel.org>]

From: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>

[ Upstream commit 0c122c280e78150b0c666fb69db0000cdd1d7e0a ]

Move all DMA aligned buffers together at the end of the structure.

1. Timestamp anynomous structure is not used with DMA so it doesn't
belong after __aligned(IIO_DMA_MINALIGN).
2. struct inv_icm42600_fifo contains it's own __aligned(IIO_DMA_MINALIGN)
within it at the end so it should not be after __aligned(IIO_DMA_MINALIGN)
in the outer struct either.
3. Normally 1 would have been considered a bug, but because of the extra
alignment from 2, it actually was OK, but we shouldn't be relying on such
quirks.

Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Link: https://patch.msgid.link/20250630-losd-3-inv-icm42600-add-wom-support-v6-1-5bb0c84800d9@tdk.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Stable-dep-of: 466f7a2fef2a ("iio: imu: inv_icm42600: Avoid configuring if already pm_runtime suspended")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iio/imu/inv_icm42600/inv_icm42600.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600.h b/drivers/iio/imu/inv_icm42600/inv_icm42600.h
index 809734e566e33..e289afcb43e3c 100644
--- a/drivers/iio/imu/inv_icm42600/inv_icm42600.h
+++ b/drivers/iio/imu/inv_icm42600/inv_icm42600.h
@@ -126,9 +126,9 @@ struct inv_icm42600_suspended {
  *  @suspended:		suspended sensors configuration.
  *  @indio_gyro:	gyroscope IIO device.
  *  @indio_accel:	accelerometer IIO device.
- *  @buffer:		data transfer buffer aligned for DMA.
- *  @fifo:		FIFO management structure.
  *  @timestamp:		interrupt timestamps.
+ *  @fifo:		FIFO management structure.
+ *  @buffer:		data transfer buffer aligned for DMA.
  */
 struct inv_icm42600_state {
 	struct mutex lock;
@@ -142,12 +142,12 @@ struct inv_icm42600_state {
 	struct inv_icm42600_suspended suspended;
 	struct iio_dev *indio_gyro;
 	struct iio_dev *indio_accel;
-	u8 buffer[2] __aligned(IIO_DMA_MINALIGN);
-	struct inv_icm42600_fifo fifo;
 	struct {
 		s64 gyro;
 		s64 accel;
 	} timestamp;
+	struct inv_icm42600_fifo fifo;
+	u8 buffer[2] __aligned(IIO_DMA_MINALIGN);
 };
 
 /* Virtual register addresses: @bank on MSB (4 upper bits), @address on LSB */
-- 
2.51.0