linux-kernel - [PATCH 5.15 43/72] reset: renesas: Fix Runtime PM usage

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Message-Id: <20220110071823.015359869@linuxfoundation.org>
Date:   Mon, 10 Jan 2022 08:23:20 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Heiner Kallweit <hkallweit1@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH 5.15 43/72] reset: renesas: Fix Runtime PM usage

From: Heiner Kallweit <hkallweit1@...il.com>

commit 92c959bae2e54ba1e2540ba5f813f7752bd76be1 upstream.

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>
Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
Link: https://lore.kernel.org/r/ec24e13f-0530-b091-7a08-864577b9b3be@gmail.com
Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/reset/reset-rzg2l-usbphy-ctrl.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- 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(struc
 	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);