linux-kernel - [PATCH 5.4 140/158] regulator: workaround self-referent regulators

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Message-Id: <20201123121826.690597325@linuxfoundation.org>
Date:   Mon, 23 Nov 2020 13:22:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ahmad Fatoum <a.fatoum@...gutronix.de>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 5.4 140/158] regulator: workaround self-referent regulators

From: Michał Mirosław <mirq-linux@...e.qmqm.pl>

commit f5c042b23f7429e5c2ac987b01a31c69059a978b upstream.

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>
Tested-by: Ahmad Fatoum <a.fatoum@...gutronix.de> # stpmic1
Link: https://lore.kernel.org/r/d703acde2a93100c3c7a81059d716c50ad1b1f52.1605226675.git.mirq-linux@rere.qmqm.pl
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/regulator/core.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1803,7 +1803,10 @@ static int regulator_resolve_supply(stru
 	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);
 	}
 
 	/*