[PATCH] char: omap-rng: fix runtime PM cleanup

[Jiawen Liu <1298662399@qq.com>]

Clean up runtime PM on deferred probe.

omap_rng_probe leaks runtime PM state if devm_clk_get returns
-EPROBE_DEFER after pm_runtime_resume_and_get succeeds. Direct return
skips put/disable.

Route -EPROBE_DEFER paths through resource-matched runtime PM cleanup in
omap_rng_probe.

Signed-off-by: jiawen <1298662399@qq.com>
---
diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c
--- a/drivers/char/hw_random/omap-rng.c
+++ b/drivers/char/hw_random/omap-rng.c
@@ -459,8 +459,10 @@
 	}
 
 	priv->clk = devm_clk_get(&pdev->dev, NULL);
-	if (PTR_ERR(priv->clk) == -EPROBE_DEFER)
-		return -EPROBE_DEFER;
+	if (PTR_ERR(priv->clk) == -EPROBE_DEFER) {
+		ret = -EPROBE_DEFER;
+		goto err_pm_runtime;
+	}
 	if (!IS_ERR(priv->clk)) {
 		ret = clk_prepare_enable(priv->clk);
 		if (ret) {
@@ -471,8 +473,10 @@
 	}
 
 	priv->clk_reg = devm_clk_get(&pdev->dev, "reg");
-	if (PTR_ERR(priv->clk_reg) == -EPROBE_DEFER)
-		return -EPROBE_DEFER;
+	if (PTR_ERR(priv->clk_reg) == -EPROBE_DEFER) {
+		ret = -EPROBE_DEFER;
+		goto err_pm_runtime_clock_1;
+	}
 	if (!IS_ERR(priv->clk_reg)) {
 		ret = clk_prepare_enable(priv->clk_reg);
 		if (ret) {
@@ -497,6 +501,16 @@
 
 	return 0;
 
+err_pm_runtime_clock_1:
+	if (!IS_ERR(priv->clk))
+		clk_disable_unprepare(priv->clk);
+	goto err_pm_runtime;
+
+err_pm_runtime:
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+	goto err_ioremap;
+
 err_register:
 	priv->base = NULL;
 	pm_runtime_put_sync(&pdev->dev);