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Date:   Sun,  9 Aug 2020 08:59:36 -0700
        Tom Rix <>
Subject: [PATCH] iio: imu: inv_mpu6050: check for temp_fifo_enable

From: Tom Rix <>

clang static analysis reports this problem

inv_mpu_ring.c:181:18: warning: Division by zero
        nb = fifo_count / bytes_per_datum;

This is a false positive.
Dividing by 0 is protected by this check

	if (!(st->chip_config.accl_fifo_enable |
		st->chip_config.gyro_fifo_enable |
		goto end_session;
	bytes_per_datum = 0;

But there is another fifo, temp_fifo

	if (st->chip_config.temp_fifo_enable)
		bytes_per_datum += INV_MPU6050_BYTES_PER_TEMP_SENSOR;

Which would be skipped if it was the only enabled fifo.
So add to the check.

Fixes: 2e4c0a5e2576 ("iio: imu: inv_mpu6050: add fifo temperature data support")

Signed-off-by: Tom Rix <>
 drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
index b533fa2dad0a..5240a400dcb4 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
@@ -141,6 +141,7 @@ irqreturn_t inv_mpu6050_read_fifo(int irq, void *p)
 	if (!(st->chip_config.accl_fifo_enable |
 		st->chip_config.gyro_fifo_enable |
+		st->chip_config.temp_fifo_enable |
 		goto end_session;
 	bytes_per_datum = 0;

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