[stable 4.19+][PATCH 07/20] hwrng: stm32 - fix unbalanced pm_runtime_enable

[Mathieu Poirier]

From: Lionel Debieve <lionel.debieve@xxxxxx>

commit af0d4442dd6813de6e77309063beb064fa8e89ae upstream

No remove function implemented yet in the driver.
Without remove function, the pm_runtime implementation
complains when removing and probing again the driver.

Signed-off-by: Lionel Debieve <lionel.debieve@xxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx> # 4.19+
Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
---
 drivers/char/hw_random/stm32-rng.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/char/hw_random/stm32-rng.c b/drivers/char/hw_random/stm32-rng.c
index 042860d97b15..37b338a76ba4 100644
--- a/drivers/char/hw_random/stm32-rng.c
+++ b/drivers/char/hw_random/stm32-rng.c
@@ -169,6 +169,13 @@ static int stm32_rng_probe(struct platform_device *ofdev)
 	return devm_hwrng_register(dev, &priv->rng);
 }
 
+static int stm32_rng_remove(struct platform_device *ofdev)
+{
+	pm_runtime_disable(&ofdev->dev);
+
+	return 0;
+}
+
 #ifdef CONFIG_PM
 static int stm32_rng_runtime_suspend(struct device *dev)
 {
@@ -210,6 +217,7 @@ static struct platform_driver stm32_rng_driver = {
 		.of_match_table = stm32_rng_match,
 	},
 	.probe = stm32_rng_probe,
+	.remove = stm32_rng_remove,
 };
 
 module_platform_driver(stm32_rng_driver);
-- 
2.17.1