linux-kernel - [PATCH 5.12 118/173] regulator: fixed: Ensure enable_counter is correct if reg_domain

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Message-Id: <20210614102702.091459873@linuxfoundation.org>
Date:   Mon, 14 Jun 2021 12:27:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Axel Lin <axel.lin@...ics.com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 5.12 118/173] regulator: fixed: Ensure enable_counter is correct if reg_domain_disable fails

From: Axel Lin <axel.lin@...ics.com>

commit 855bfff9d623e7aff6556bfb6831d324dec8d96a upstream.

dev_pm_genpd_set_performance_state() may fail, so had better to check it's
return value before decreasing priv->enable_counter.

Fixes: bf3a28cf4241 ("regulator: fixed: support using power domain for enable/disable")
Signed-off-by: Axel Lin <axel.lin@...ics.com>
Link: https://lore.kernel.org/r/20210520111811.1806293-1-axel.lin@ingics.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/regulator/fixed.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -88,10 +88,15 @@ static int reg_domain_disable(struct reg
 {
 	struct fixed_voltage_data *priv = rdev_get_drvdata(rdev);
 	struct device *dev = rdev->dev.parent;
+	int ret;
+
+	ret = dev_pm_genpd_set_performance_state(dev, 0);
+	if (ret)
+		return ret;
 
 	priv->enable_counter--;
 
-	return dev_pm_genpd_set_performance_state(dev, 0);
+	return 0;
 }
 
 static int reg_is_enabled(struct regulator_dev *rdev)