[PATCH] hwrng: omap: disable runtime PM on resume failure

[Myeonghun Pak]

omap_rng_probe() enables runtime PM before calling
pm_runtime_resume_and_get().  If the resume call fails, the error path
currently jumps to err_ioremap and returns without disabling runtime PM
again.

Add a runtime-PM-only error label and route the resume failure through it.
The label is placed after the runtime PM usage-count unwind, so later
probe failures keep using the existing pm_runtime_put_sync() path while
this early failure only disables the runtime PM state that was already
enabled.

Fixes: 61dc0a446e5d ("hwrng: omap - Fix assumption that runtime_get_sync will always succeed")
Co-developed-by: Ijae Kim <ae878000@xxxxxxxxx>
Signed-off-by: Ijae Kim <ae878000@xxxxxxxxx>
Signed-off-by: Myeonghun Pak <mhun512@xxxxxxxxx>
---
 drivers/char/hw_random/omap-rng.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c
index 5e8b50f15dc3..44b8bb4a24a8 100644
--- a/drivers/char/hw_random/omap-rng.c
+++ b/drivers/char/hw_random/omap-rng.c
@@ -455,7 +455,7 @@ static int omap_rng_probe(struct platform_device *pdev)
 	ret = pm_runtime_resume_and_get(&pdev->dev);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to runtime_get device: %d\n", ret);
-		goto err_ioremap;
+		goto err_pm_disable;
 	}
 
 	priv->clk = devm_clk_get(&pdev->dev, NULL);
@@ -499,6 +499,7 @@ err_register:
 err_register:
 	priv->base = NULL;
 	pm_runtime_put_sync(&pdev->dev);
+err_pm_disable:
 	pm_runtime_disable(&pdev->dev);
 
 	clk_disable_unprepare(priv->clk_reg);
-- 
2.47.1