[PATCH v2] net: mdio: airoha: fix reset control leak in error path

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

In airoha_mdio_probe(), after calling reset_control_deassert(),
if clk_set_rate() fails, the function returns immediately without
calling reset_control_assert(). This leaves the reset line
deasserted and causes a reference count leak on shared reset
controllers.

Fix this by reorganizing the error handling to use a goto label,
ensuring reset_control_assert() is called on all error paths
before returning.

Also add error checking for reset_control_deassert().
Fixes: 67e3ba978361 ("net: mdio: Add MDIO bus controller for Airoha AN7583")
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 drivers/net/mdio/mdio-airoha.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/mdio/mdio-airoha.c b/drivers/net/mdio/mdio-airoha.c
index 52e7475121ea..4c1b2415687c 100644
--- a/drivers/net/mdio/mdio-airoha.c
+++ b/drivers/net/mdio/mdio-airoha.c
@@ -246,15 +246,17 @@ static int airoha_mdio_probe(struct platform_device *pdev)
 
 	ret = clk_set_rate(priv->clk, freq);
 	if (ret)
-		return ret;
+		goto err_reset_assert;
 
 	ret = devm_of_mdiobus_register(dev, bus, dev->of_node);
-	if (ret) {
-		reset_control_assert(priv->reset);
-		return ret;
-	}
+	if (ret)
+		goto err_reset_assert;
 
 	return 0;
+
+err_reset_assert:
+	reset_control_assert(priv->reset);
+	return ret;
 }
 
 static const struct of_device_id airoha_mdio_dt_ids[] = {
-- 
2.39.5 (Apple Git-154)