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regulator: core: Properly handle case where supply is the couple 

Check whether supply regulator is the couple to avoid infinite recursion
during of locking.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Dmitry Osipenko 2018-11-19 00:56:18 +03:00 committed by Mark Brown
parent f8702f9e4a
commit 089e2cc2e1
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GPG Key ID: 24D68B725D5487D0
1 changed files with 17 additions and 2 deletions
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19
drivers/regulator/core.c
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@ -233,6 +233,21 @@ void regulator_unlock(struct regulator_dev *rdev)
mutex_unlock(&regulator_nesting_mutex);
}
static bool regulator_supply_is_couple(struct regulator_dev *rdev)
{
struct regulator_dev *c_rdev;
int i;
for (i = 1; i < rdev->coupling_desc.n_coupled; i++) {
c_rdev = rdev->coupling_desc.coupled_rdevs[i];
if (rdev->supply->rdev == c_rdev)
return true;
}
return false;
}
static void regulator_unlock_recursive(struct regulator_dev *rdev,
unsigned int n_coupled)
{
@ -245,7 +260,7 @@ static void regulator_unlock_recursive(struct regulator_dev *rdev,
if (!c_rdev)
continue;
if (c_rdev->supply)
if (c_rdev->supply && !regulator_supply_is_couple(c_rdev))
regulator_unlock_recursive(
c_rdev->supply->rdev,
c_rdev->coupling_desc.n_coupled);
@ -283,7 +298,7 @@ static int regulator_lock_recursive(struct regulator_dev *rdev,
*old_contended_rdev = NULL;
}
if (c_rdev->supply) {
if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) {
err = regulator_lock_recursive(c_rdev->supply->rdev,
new_contended_rdev,
old_contended_rdev,