[PATCH] regulator: rt6190: Fix runtime PM imbalance in rt6190_out_enable()

[Wentao Liang <vulab@iscas.ac.cn>]

In rt6190_out_enable(), pm_runtime_get_sync() is called at the start of
the function. However, if any subsequent regmap or regulator operation
fails, the function returns directly without dropping the runtime PM
reference, causing a runtime PM reference leak.

Add an error handling path with pm_runtime_put() to keep the reference
count balanced on failure.

Fixes: e6999e7cca7e ("regulator: rt6190: Add support for Richtek RT6190 regulator")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 drivers/regulator/rt6190-regulator.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/regulator/rt6190-regulator.c b/drivers/regulator/rt6190-regulator.c
index 3883440295ed..bf99e18f6d5b 100644
--- a/drivers/regulator/rt6190-regulator.c
+++ b/drivers/regulator/rt6190-regulator.c
@@ -109,19 +109,27 @@ static int rt6190_out_enable(struct regulator_dev *rdev)
 	ret = regmap_raw_read(regmap, RT6190_REG_OUTV, out_cfg,
 			      sizeof(out_cfg));
 	if (ret)
-		return ret;
+		goto err_pm_put;
 
 	ret = regulator_enable_regmap(rdev);
 	if (ret)
-		return ret;
+		goto err_pm_put;
 
 	ret = regmap_raw_write(regmap, RT6190_REG_OUTV, out_cfg,
 			       sizeof(out_cfg));
 	if (ret)
-		return ret;
+		goto err_pm_put;
+
+	ret = regmap_update_bits(regmap, RT6190_REG_SET5, RT6190_ENGCP_MASK,
+				 RT6190_ENGCP_MASK);
+	if (ret)
+		goto err_pm_put;
+
+	return 0;
 
-	return regmap_update_bits(regmap, RT6190_REG_SET5, RT6190_ENGCP_MASK,
-				  RT6190_ENGCP_MASK);
+err_pm_put:
+	pm_runtime_put(data->dev);
+	return ret;
 }
 
 static int rt6190_out_disable(struct regulator_dev *rdev)
-- 
2.34.1