[PATCH 6.1 235/451] drm/tegra: dpaux: Fix PM disable depth imbalance in tegra_dpaux_probe

[Sasha Levin]

From: Zhang Shurong <zhang_shurong@xxxxxxxxxxx>

[ Upstream commit 0800880f4eb789b7d299db40f2e86e056bd33a4e ]

The pm_runtime_enable function increases the power disable depth,
which means that we must perform a matching decrement on the error
handling path to maintain balance within the given context.
Additionally, we need to address the same issue for pm_runtime_get_sync.
We fix this by invoking pm_runtime_disable and pm_runtime_put_sync
when error returns.

Fixes: 82b81b3ec1a7 ("drm/tegra: dpaux: Implement runtime PM")
Signed-off-by: Zhang Shurong <zhang_shurong@xxxxxxxxxxx>
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/tencent_B13DB7F6C0023C46157250A524966F326A09@xxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/tegra/dpaux.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c
index d773ef4854188..b563988fb6848 100644
--- a/drivers/gpu/drm/tegra/dpaux.c
+++ b/drivers/gpu/drm/tegra/dpaux.c
@@ -524,7 +524,7 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
 	if (err < 0) {
 		dev_err(dpaux->dev, "failed to request IRQ#%u: %d\n",
 			dpaux->irq, err);
-		return err;
+		goto err_pm_disable;
 	}
 
 	disable_irq(dpaux->irq);
@@ -544,7 +544,7 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
 	 */
 	err = tegra_dpaux_pad_config(dpaux, DPAUX_PADCTL_FUNC_I2C);
 	if (err < 0)
-		return err;
+		goto err_pm_disable;
 
 #ifdef CONFIG_GENERIC_PINCONF
 	dpaux->desc.name = dev_name(&pdev->dev);
@@ -557,7 +557,8 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
 	dpaux->pinctrl = devm_pinctrl_register(&pdev->dev, &dpaux->desc, dpaux);
 	if (IS_ERR(dpaux->pinctrl)) {
 		dev_err(&pdev->dev, "failed to register pincontrol\n");
-		return PTR_ERR(dpaux->pinctrl);
+		err = PTR_ERR(dpaux->pinctrl);
+		goto err_pm_disable;
 	}
 #endif
 	/* enable and clear all interrupts */
@@ -573,10 +574,15 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
 	err = devm_of_dp_aux_populate_ep_devices(&dpaux->aux);
 	if (err < 0) {
 		dev_err(dpaux->dev, "failed to populate AUX bus: %d\n", err);
-		return err;
+		goto err_pm_disable;
 	}
 
 	return 0;
+
+err_pm_disable:
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+	return err;
 }
 
 static int tegra_dpaux_remove(struct platform_device *pdev)
-- 
2.43.0