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iio: imu: inv_mpu6050: fix FIFO parsing when empty 

commit 60caa8b33b 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: 0829edc43e ("iio: imu: inv_mpu6050: read the full fifo when processing data")
Cc: stable@vger.kernel.org
Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Link: https://lore.kernel.org/r/20240219154825.90656-1-inv.git-commit@tdk.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jean-Baptiste Maneyrol 2024-02-19 15:48:25 +00:00 committed by Greg Kroah-Hartman
parent 3df5e345d6
commit 60b9d1887a
1 changed files with 2 additions and 0 deletions
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2
drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
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@ -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);