Prevent st_lsm6dsx_read_fifo and st_lsm6dsx_read_tagged_fifo functions
from falling in an infinite loop in case pattern_len is equal to zero and
the device FIFO is not empty.
Signed-off-by: Silvano Seva <s.seva@xxxxxxxxx>
---
drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
index 0a7cd8c1aa33..39a7e15ae9ae 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
@@ -392,9 +392,14 @@ int st_lsm6dsx_read_fifo(struct st_lsm6dsx_hw *hw)
if (fifo_status & cpu_to_le16(ST_LSM6DSX_FIFO_EMPTY_MASK))
return 0;
+ if (!pattern_len)
+ pattern_len = ST_LSM6DSX_SAMPLE_SIZE;
+
fifo_len = (le16_to_cpu(fifo_status) & fifo_diff_mask) *
ST_LSM6DSX_CHAN_SIZE;
fifo_len = (fifo_len / pattern_len) * pattern_len;
+ if (!fifo_len)
+ return 0;
acc_sensor = iio_priv(hw->iio_devs[ST_LSM6DSX_ID_ACC]);
gyro_sensor = iio_priv(hw->iio_devs[ST_LSM6DSX_ID_GYRO]);
@@ -623,6 +628,9 @@ int st_lsm6dsx_read_tagged_fifo(struct st_lsm6dsx_hw *hw)
if (!fifo_len)
return 0;
+ if (!pattern_len)
+ pattern_len = ST_LSM6DSX_TAGGED_SAMPLE_SIZE;
+
for (read_len = 0; read_len < fifo_len; read_len += pattern_len) {
err = st_lsm6dsx_read_block(hw,
ST_LSM6DSX_REG_FIFO_OUT_TAG_ADDR,
--
2.48.1
