linux-kernel - [PATCH resend v3] reset: renesas: Fix Runtime PM usage

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Date:   Wed, 15 Dec 2021 11:14:23 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>,
        Biju Das <biju.das.jz@...renesas.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH resend v3] reset: renesas: Fix Runtime PM usage

If pm_runtime_resume_and_get() fails then it returns w/o the RPM usage
counter being incremented. In this case call pm_runtime_put() in
remove() will result in a usage counter imbalance. Therefore check the
return code of pm_runtime_resume_and_get() and bail out in case of error.

Fixes: bee08559701f ("reset: renesas: Add RZ/G2L usbphy control driver")
Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
v2:
- bail out in case of error instead of switching to pm_runtime_get_sync()
v3:
- add dev_err_probe() in case of error
---
 drivers/reset/reset-rzg2l-usbphy-ctrl.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/reset/reset-rzg2l-usbphy-ctrl.c b/drivers/reset/reset-rzg2l-usbphy-ctrl.c
index e0704fd2b..46fcd2218 100644
--- a/drivers/reset/reset-rzg2l-usbphy-ctrl.c
+++ b/drivers/reset/reset-rzg2l-usbphy-ctrl.c
@@ -137,7 +137,12 @@ static int rzg2l_usbphy_ctrl_probe(struct platform_device *pdev)
 	dev_set_drvdata(dev, priv);
 
 	pm_runtime_enable(&pdev->dev);
-	pm_runtime_resume_and_get(&pdev->dev);
+	error = pm_runtime_resume_and_get(&pdev->dev);
+	if (error < 0) {
+		pm_runtime_disable(&pdev->dev);
+		reset_control_assert(priv->rstc);
+		return dev_err_probe(&pdev->dev, error, "pm_runtime_resume_and_get failed");
+	}
 
 	/* put pll and phy into reset state */
 	spin_lock_irqsave(&priv->lock, flags);
-- 
2.34.1