6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@xxxxxxx>
commit 60caa8b33bd682a9ed99d1fc3f91d74e1acc9922 upstream.
Now that we are reading the full FIFO in the interrupt handler,
it is possible to have an emply FIFO since we are still receiving
1 interrupt per data. Handle correctly this case instead of having
an error causing a reset of the FIFO.
Fixes: 0829edc43e0a ("iio: imu: inv_mpu6050: read the full fifo when processing data")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@xxxxxxx>
Link: https://lore.kernel.org/r/20240219154825.90656-1-inv.git-commit@xxxxxxx
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
index 66d4ba088e70..d4f9b5d8d28d 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
@@ -109,6 +109,8 @@ irqreturn_t inv_mpu6050_read_fifo(int irq, void *p)
/* compute and process only all complete datum */
nb = fifo_count / bytes_per_datum;
fifo_count = nb * bytes_per_datum;
+ if (nb == 0)
+ goto end_session;
/* Each FIFO data contains all sensors, so same number for FIFO and sensor data */
fifo_period = NSEC_PER_SEC / INV_MPU6050_DIVIDER_TO_FIFO_RATE(st->chip_config.divider);
inv_sensors_timestamp_interrupt(&st->timestamp, fifo_period, nb, nb, pf->timestamp);
--
2.44.0
