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authorDouglas Anderson <dianders@chromium.org>2018-08-16 23:28:03 +0300
committerMark Brown <broonie@kernel.org>2018-08-28 23:10:23 +0300
commit7e4d9683d6a716533f5c5026795b7b1ebdbcb2ed (patch)
tree422533b4d3a8a905f2217c312ba7b5b52598b44c /drivers/regulator
parent7d3827b5954840ff7765aef282257b7368b5ea67 (diff)
downloadlinux-7e4d9683d6a716533f5c5026795b7b1ebdbcb2ed.tar.xz
regulator: core: Add locking to debugfs regulator_summary
Most functions that access the rdev lock the rdev mutex before looking at data. ...but not the code that implements the debugfs regulator_summary. It probably should though, so let's do it. Note: this fixes no known issues. The problem was found only by code inspection. Signed-off-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/core.c51
1 files changed, 31 insertions, 20 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index df55cf8f09f0..f686f2311317 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3475,21 +3475,23 @@ out:
}
EXPORT_SYMBOL_GPL(regulator_set_current_limit);
+static int _regulator_get_current_limit_unlocked(struct regulator_dev *rdev)
+{
+ /* sanity check */
+ if (!rdev->desc->ops->get_current_limit)
+ return -EINVAL;
+
+ return rdev->desc->ops->get_current_limit(rdev);
+}
+
static int _regulator_get_current_limit(struct regulator_dev *rdev)
{
int ret;
regulator_lock(rdev);
-
- /* sanity check */
- if (!rdev->desc->ops->get_current_limit) {
- ret = -EINVAL;
- goto out;
- }
-
- ret = rdev->desc->ops->get_current_limit(rdev);
-out:
+ ret = _regulator_get_current_limit_unlocked(rdev);
regulator_unlock(rdev);
+
return ret;
}
@@ -3554,21 +3556,23 @@ out:
}
EXPORT_SYMBOL_GPL(regulator_set_mode);
+static unsigned int _regulator_get_mode_unlocked(struct regulator_dev *rdev)
+{
+ /* sanity check */
+ if (!rdev->desc->ops->get_mode)
+ return -EINVAL;
+
+ return rdev->desc->ops->get_mode(rdev);
+}
+
static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
{
int ret;
regulator_lock(rdev);
-
- /* sanity check */
- if (!rdev->desc->ops->get_mode) {
- ret = -EINVAL;
- goto out;
- }
-
- ret = rdev->desc->ops->get_mode(rdev);
-out:
+ ret = _regulator_get_mode_unlocked(rdev);
regulator_unlock(rdev);
+
return ret;
}
@@ -4675,18 +4679,23 @@ static void regulator_summary_show_subtree(struct seq_file *s,
struct regulation_constraints *c;
struct regulator *consumer;
struct summary_data summary_data;
+ unsigned int opmode;
if (!rdev)
return;
+ regulator_lock_nested(rdev, level);
+
+ opmode = _regulator_get_mode_unlocked(rdev);
seq_printf(s, "%*s%-*s %3d %4d %6d %7s ",
level * 3 + 1, "",
30 - level * 3, rdev_get_name(rdev),
rdev->use_count, rdev->open_count, rdev->bypass_count,
- regulator_opmode_to_str(_regulator_get_mode(rdev)));
+ regulator_opmode_to_str(opmode));
seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
- seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000);
+ seq_printf(s, "%5dmA ",
+ _regulator_get_current_limit_unlocked(rdev) / 1000);
c = rdev->constraints;
if (c) {
@@ -4733,6 +4742,8 @@ static void regulator_summary_show_subtree(struct seq_file *s,
class_for_each_device(&regulator_class, NULL, &summary_data,
regulator_summary_show_children);
+
+ regulator_unlock(rdev);
}
static int regulator_summary_show_roots(struct device *dev, void *data)