diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-06-26 10:57:51 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-07-03 20:28:04 +0100 |
| commit | e113d792d56d4b720b3d84c122b6af84c3bfa094 (patch) | |
| tree | 3dbf10393fed4c59569afc93f777b96e0d9b0af4 /drivers/regulator | |
| parent | c5f3939b8fe0c358d35397982e5afdef112afc81 (diff) | |
regulator: core: Check that the selector from map_voltage() is valid
Lots of regulator drivers have checks in their map_voltage() functions
to verify that the result of the mapping is in the range originally
specified. Factor these out in the core and provide a bit of extra
defensiveness for other drivers by doing the check in the core.
Since we're now doing a list_voltage() earlier move the current mapping
back to a voltage out into the set_voltage() call to save redoing it.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/regulator')
| -rw-r--r-- | drivers/regulator/core.c | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index a80886626230..f98a8ee29933 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -2040,7 +2040,7 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev, { int ret; int delay = 0; - int best_val; + int best_val = 0; unsigned int selector; int old_selector = -1; @@ -2064,6 +2064,15 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev, if (rdev->desc->ops->set_voltage) { ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, &selector); + + if (ret >= 0) { + if (rdev->desc->ops->list_voltage) + best_val = rdev->desc->ops->list_voltage(rdev, + selector); + else + best_val = _regulator_get_voltage(rdev); + } + } else if (rdev->desc->ops->set_voltage_sel) { if (rdev->desc->ops->map_voltage) { ret = rdev->desc->ops->map_voltage(rdev, min_uV, @@ -2079,18 +2088,19 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev, } if (ret >= 0) { - selector = ret; - ret = rdev->desc->ops->set_voltage_sel(rdev, ret); + best_val = rdev->desc->ops->list_voltage(rdev, ret); + if (min_uV <= best_val && max_uV >= best_val) { + selector = ret; + ret = rdev->desc->ops->set_voltage_sel(rdev, + ret); + } else { + ret = -EINVAL; + } } } else { ret = -EINVAL; } - if (rdev->desc->ops->list_voltage) - best_val = rdev->desc->ops->list_voltage(rdev, selector); - else - best_val = _regulator_get_voltage(rdev); - /* Call set_voltage_time_sel if successfully obtained old_selector */ if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 && rdev->desc->ops->set_voltage_time_sel) { |