linux-kernel - [PATCH] usb: phy: add missing put_device() call in tegra_usb_phy_parse

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Date:   Tue,  7 Dec 2021 04:56:34 -0800
From:   Qing Wang <wangqing@...o.com>
To:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-usb@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Wang Qing <wangqing@...o.com>
Subject: [PATCH] usb: phy: add missing put_device() call in tegra_usb_phy_parse_pmc()

From: Wang Qing <wangqing@...o.com>

of_find_device_by_node() takes a reference to the embedded struct device 
which needs to be dropped when error return.

Add a jump target to fix the exception handling for this 
function implementation.

Signed-off-by: Wang Qing <wangqing@...o.com>
---
 drivers/usb/phy/phy-tegra-usb.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index 68cd4b6..5678b7f
--- a/drivers/usb/phy/phy-tegra-usb.c
+++ b/drivers/usb/phy/phy-tegra-usb.c
@@ -1300,18 +1300,26 @@ static int tegra_usb_phy_parse_pmc(struct device *dev,
 	err = devm_add_action_or_reset(dev, tegra_usb_phy_put_pmc_device,
 				       &pmc_pdev->dev);
 	if (err)
-		return err;
+		goto error_put_device;
 
-	if (!platform_get_drvdata(pmc_pdev))
-		return -EPROBE_DEFER;
+	if (!platform_get_drvdata(pmc_pdev)) {
+		err = -EPROBE_DEFER;
+		goto error_put_device;
+	}
 
 	phy->pmc_regmap = dev_get_regmap(&pmc_pdev->dev, "usb_sleepwalk");
-	if (!phy->pmc_regmap)
-		return -EINVAL;
+	if (!phy->pmc_regmap) {
+		err = -EINVAL;
+		goto error_put_device;
+	}
 
 	phy->instance = args.args[0];
 
 	return 0;
+
+error_put_device:
+	put_device(&pmc_pdev->dev);
+	return err;
 }
 
 static const struct tegra_phy_soc_config tegra20_soc_config = {
-- 
2.7.4