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regulator: check that dummy regulator has been probed before using it

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commit 2c7a50bec4958f1d1c84d19cde518d0e96a676fd upstream.

Due to asynchronous driver probing there is a chance that the dummy
regulator hasn't already been probed when first accessing it.

Cc: stable@vger.kernel.org
Signed-off-by: Christian Eggers <ceggers@arri.de>
Link: https://patch.msgid.link/20250313103051.32430-3-ceggers@arri.de
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Eggers
2025-03-13 11:27:39 +01:00
committed by Greg Kroah-Hartman
parent d3b83a1442
commit a99f1254b1
1 changed files with 11 additions and 1 deletions
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drivers/regulator/core.c
+11 -1
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@@ -2024,6 +2024,10 @@ static int regulator_resolve_supply(struct regulator_dev *rdev)
if (have_full_constraints()) {
r = dummy_regulator_rdev;
if (!r) {
ret = -EPROBE_DEFER;
goto out;
}
get_device(&r->dev);
} else {
dev_err(dev, "Failed to resolve %s-supply for %s\n",
@@ -2041,6 +2045,10 @@ static int regulator_resolve_supply(struct regulator_dev *rdev)
goto out;
}
r = dummy_regulator_rdev;
if (!r) {
ret = -EPROBE_DEFER;
goto out;
}
get_device(&r->dev);
}
@@ -2166,8 +2174,10 @@ struct regulator *_regulator_get_common(struct regulator_dev *rdev, struct devic
* enabled, even if it isn't hooked up, and just
* provide a dummy.
*/
dev_warn(dev, "supply %s not found, using dummy regulator\n", id);
rdev = dummy_regulator_rdev;
if (!rdev)
return ERR_PTR(-EPROBE_DEFER);
dev_warn(dev, "supply %s not found, using dummy regulator\n", id);
get_device(&rdev->dev);
break;