[PATCH] iio: imu: inv_icm42600: fix 64bit multiplication

[Antonio Quartulli <antonio@mandelbit.com>]

In inv_icm42600_accel_convert_wom_to_roc() multiplying
`threshold` by `convert` may result in a number requiring more
than 32bit.
In this case, although `value` is 64bit wide, the result is
truncated because the multiplication is performed in the
32bit domain, due to both operands being 32bit long.

Cast the first operand to u64 to ensure the multiplication is
performed in the expected domain.

Fixes: 50cfaa9a46c8 ("iio: imu: inv_icm42600: add WoM support")
Address-Coverity-ID: 1647596 ("Integer handling issues (OVERFLOW_BEFORE_WIDEN)")
Signed-off-by: Antonio Quartulli <antonio@mandelbit.com>
---
 drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c
index 7a28051330b7..218bb3eb3dd7 100644
--- a/drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c
+++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c
@@ -347,7 +347,7 @@ static u64 inv_icm42600_accel_convert_wom_to_roc(unsigned int threshold,
 	u64 value;
 	u64 freq_uhz;
 
-	value = threshold * convert;
+	value = (u64)threshold * convert;
 	freq_uhz = (u64)accel_hz * MICRO + (u64)accel_uhz;
 
 	/* compute the differential by multiplying by the frequency */
-- 
2.49.1