linux-kernel - [PATCH 4/4] regulator: workaround self-referent regulators

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Message-Id: <6e250bd5d444db3afd010b1ce66db9843a9114d1.1605225991.git.mirq-linux@rere.qmqm.pl>
Date:   Fri, 13 Nov 2020 01:16:50 +0100
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     Ahmad Fatoum <a.fatoum@...gutronix.de>,
        linux-arm-kernel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] regulator: workaround self-referent regulators

Workaround regulators whose supply name happens to be the same as its
own name. This fixes boards that used to work before the early supply
resolving was removed. The error message is left in place so that
offending drivers can be detected.

Fixes: aea6cb99703e ("regulator: resolve supply after creating regulator")
Cc: stable@...r.kernel.org
Reported-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 drivers/regulator/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index ab922ed273f3..38ba579efe2b 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1844,7 +1844,10 @@ static int regulator_resolve_supply(struct regulator_dev *rdev)
 	if (r == rdev) {
 		dev_err(dev, "Supply for %s (%s) resolved to itself\n",
 			rdev->desc->name, rdev->supply_name);
-		return -EINVAL;
+		if (!have_full_constraints())
+			return -EINVAL;
+		r = dummy_regulator_rdev;
+		get_device(&r->dev);
 	}
 
 	/*
-- 
2.20.1