regulator: core: Ensure simple linear voltage mappings falls within the specified...

Integer division may truncate the result.
Use DIV_ROUND_UP to ensure simple linear voltage mappings falls within the
specified range.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 5751f5ed47c0f5a780d6157d2251fe3e60fe10fc..8918271f9e85b20eff09e84398bc74b54645819d 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2047,7 +2047,7 @@ int regulator_map_voltage_linear(struct regulator_dev *rdev,
                return -EINVAL;
        }
 
-       ret = (min_uV - rdev->desc->min_uV) / rdev->desc->uV_step;
+       ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
        if (ret < 0)
                return ret;