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SubjectApplied "regulator: core: Properly handle case where supply is the couple" to the regulator tree
The patch

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

has been applied to the regulator tree at

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
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From 089e2cc2e1861ad13a56811aa538419989346089 Mon Sep 17 00:00:00 2001
From: Dmitry Osipenko <>
Date: Mon, 19 Nov 2018 00:56:18 +0300
Subject: [PATCH] regulator: core: Properly handle case where supply is the

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

Signed-off-by: Dmitry Osipenko <>
Signed-off-by: Mark Brown <>
drivers/regulator/core.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 47ccd35c7965..e46e53aa43db 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -233,6 +233,21 @@ void regulator_unlock(struct regulator_dev *rdev)

+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)

- if (c_rdev->supply)
+ if (c_rdev->supply && !regulator_supply_is_couple(c_rdev))
@@ -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,
 \ /
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