linux-kernel - [PATCH v2] phy: Fix error handling in tegra_xusb_port

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Message-Id: <20250110021814.1349011-1-make24@iscas.ac.cn>
Date: Fri, 10 Jan 2025 10:18:14 +0800
From: Ma Ke <make24@...as.ac.cn>
To: jckuo@...dia.com,
	vkoul@...nel.org,
	kishon@...nel.org,
	thierry.reding@...il.com,
	jonathanh@...dia.com
Cc: linux-phy@...ts.infradead.org,
	linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ma Ke <make24@...as.ac.cn>,
	stable@...r.kernel.org
Subject: [PATCH v2] phy: Fix error handling in tegra_xusb_port_init

If device_add() fails, do not use device_unregister() for error
handling. device_unregister() consists two functions: device_del() and
put_device(). device_unregister() should only be called after
device_add() succeeded because device_del() undoes what device_add()
does if successful. Change device_unregister() to put_device() call
before returning from the function.

As comment of device_add() says, 'if device_add() succeeds, you should
call device_del() when you want to get rid of it. If device_add() has
not succeeded, use only put_device() to drop the reference count'.

Found by code review.

Cc: stable@...r.kernel.org
Fixes: 53d2a715c240 ("phy: Add Tegra XUSB pad controller support")
Signed-off-by: Ma Ke <make24@...as.ac.cn>
---
Changes in v2:
- modified the bug description as suggestions.
---
 drivers/phy/tegra/xusb.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
index 79d4814d758d..c89df95aa6ca 100644
--- a/drivers/phy/tegra/xusb.c
+++ b/drivers/phy/tegra/xusb.c
@@ -548,16 +548,16 @@ static int tegra_xusb_port_init(struct tegra_xusb_port *port,

 	err = dev_set_name(&port->dev, "%s-%u", name, index);
 	if (err < 0)
-		goto unregister;
+		goto put_device;

 	err = device_add(&port->dev);
 	if (err < 0)
-		goto unregister;
+		goto put_device;

 	return 0;

-unregister:
-	device_unregister(&port->dev);
+put_device:
+	put_device(&port->dev);
 	return err;
 }

-- 
2.25.1