linux-kernel - [PATCH 3.4 058/172] USB: serial: fix tty-device error handling at probe

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Date:	Tue, 16 Jun 2015 16:35:12 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 058/172] USB: serial: fix tty-device error handling at probe

From: Johan Hovold <johan@...nel.org>

3.4.108-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit ca4383a3947a83286bc9b9c598a1f55e867871d7 upstream.

Add missing error handling when registering the tty device at port
probe. This avoids trying to remove an uninitialised character device
when the port device is removed.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Johan Hovold <johan@...nel.org>
Acked-by: Greg Kroah-Hartman <greg@...ah.com>
[lizf: Backported to 3.4:
 - adjust context
 - s/goto exit_with_autopm/goto exit]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/usb/serial/bus.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/serial/bus.c b/drivers/usb/serial/bus.c
index 1b59665..358d2d6 100644
--- a/drivers/usb/serial/bus.c
+++ b/drivers/usb/serial/bus.c
@@ -52,6 +52,7 @@ static int usb_serial_device_probe(struct device *dev)
 {
 	struct usb_serial_driver *driver;
 	struct usb_serial_port *port;
+	struct device *tty_dev;
 	int retval = 0;
 	int minor;
 
@@ -76,7 +77,15 @@ static int usb_serial_device_probe(struct device *dev)
 	}
 
 	minor = port->number;
-	tty_register_device(usb_serial_tty_driver, minor, dev);
+	tty_dev = tty_register_device(usb_serial_tty_driver, minor, dev);
+	if (IS_ERR(tty_dev)) {
+		retval = PTR_ERR(tty_dev);
+		device_remove_file(dev, &dev_attr_port_number);
+		if (driver->port_remove)
+			driver->port_remove(port);
+		goto exit;
+	}
+
 	dev_info(&port->serial->dev->dev,
 		 "%s converter now attached to ttyUSB%d\n",
 		 driver->description, minor);
-- 
1.9.1

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