regulator: workaround self-referent regulators

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

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 2dd7e87ee37811f604aaf91def375c56866a0763..8a6ca06d9c160f844593187f0efc3b7bc16317e9 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1598,7 +1598,10 @@ 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);
        }
 
        /*