[PATCH] drm/bridge: microchip-lvds: Fix runtime PM leak in mchp_lvds_enable()

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

mchp_lvds_enable() resumes the device with pm_runtime_get_sync() and
returns early when the resume fails.  pm_runtime_get_sync() increments
the runtime PM usage count even when it fails, so returning without
dropping the reference leaks it and prevents the device from ever
suspending again once the error has been hit.

Drop the runtime PM reference with pm_runtime_put_noidle() on the
resume failure path before returning.

Fixes: 179b0769fc5f ("drm/bridge: add lvds controller support for sam9x7")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 drivers/gpu/drm/bridge/microchip-lvds.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/bridge/microchip-lvds.c b/drivers/gpu/drm/bridge/microchip-lvds.c
index 9f4ff82bc6b4..b77ec6ae0a97 100644
--- a/drivers/gpu/drm/bridge/microchip-lvds.c
+++ b/drivers/gpu/drm/bridge/microchip-lvds.c
@@ -127,6 +127,7 @@ static void mchp_lvds_enable(struct drm_bridge *bridge)
 	ret = pm_runtime_get_sync(lvds->dev);
 	if (ret < 0) {
 		dev_err(lvds->dev, "failed to get pm runtime: %d\n", ret);
+		pm_runtime_put_noidle(lvds->dev);
 		return;
 	}
 
-- 
2.34.1