[PATCH 6.6 211/267] iio: invensense: fix interrupt timestamp alignment

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6.6-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit 0340dc4c82590d8735c58cf904a8aa1173273ab5 upstream.

Restrict interrupt timestamp alignment for not overflowing max/min
period thresholds.

Fixes: 0ecc363ccea7 ("iio: make invensense timestamp module generic")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@xxxxxxx>
Link: https://lore.kernel.org/r/20240426135814.141837-1-inv.git-commit@xxxxxxx
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/iio/common/inv_sensors/inv_sensors_timestamp.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/iio/common/inv_sensors/inv_sensors_timestamp.c
+++ b/drivers/iio/common/inv_sensors/inv_sensors_timestamp.c
@@ -105,6 +105,9 @@ static bool inv_update_chip_period(struc
 
 static void inv_align_timestamp_it(struct inv_sensors_timestamp *ts)
 {
+	const int64_t period_min = ts->min_period * ts->mult;
+	const int64_t period_max = ts->max_period * ts->mult;
+	int64_t add_max, sub_max;
 	int64_t delta, jitter;
 	int64_t adjust;
 
@@ -112,11 +115,13 @@ static void inv_align_timestamp_it(struc
 	delta = ts->it.lo - ts->timestamp;
 
 	/* adjust timestamp while respecting jitter */
+	add_max = period_max - (int64_t)ts->period;
+	sub_max = period_min - (int64_t)ts->period;
 	jitter = INV_SENSORS_TIMESTAMP_JITTER((int64_t)ts->period, ts->chip.jitter);
 	if (delta > jitter)
-		adjust = jitter;
+		adjust = add_max;
 	else if (delta < -jitter)
-		adjust = -jitter;
+		adjust = sub_max;
 	else
 		adjust = 0;
 






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