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regulator: avoid resolve_supply() infinite recursion

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commit 4b639e254d3d4f15ee4ff2b890a447204cfbeea9 upstream.

When a regulator's name equals its supply's name the
regulator_resolve_supply() recurses indefinitely. Add a check
so that debugging the problem is easier. The "fixed" commit
just exposed the problem.

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/c6171057cfc0896f950c4d8cb82df0f9f1b89ad9.1605226675.git.mirq-linux@rere.qmqm.pl
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michał Mirosław 2020-11-13 01:20:28 +01:00 • committed by Greg Kroah-Hartman
commit 0d233d5766
1 changed files with 6 additions and 0 deletions
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6
drivers/regulator/core.c
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@ -1800,6 +1800,12 @@ 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 the supply's parent device is not the same as the
* regulator's parent device, then ensure the parent device