linux-kernel - [PATCH] drivers: usb: smsusb: fix error handling code in smsusb_init

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Message-Id: <20230227102411.3273877-1-dzm91@hust.edu.cn>
Date:   Mon, 27 Feb 2023 18:24:08 +0800
From:   Dongliang Mu <dzm91@...t.edu.cn>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Duoming Zhou <duoming@....edu.cn>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Dongliang Mu <dzm91@...t.edu.cn>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drivers: usb: smsusb: fix error handling code in smsusb_init_device

The previous commit 4b208f8b561f moves siano_media_device_register
before smscore_register_device, and adds corresponding error handling
code if smscore_register_device fails. However, it misses the following
error handling code of smsusb_init_device.

Fix this by moving error handling code at the end of smsusb_init_device
and adding a goto statement in the following error handling parts.

Fixes: 4b208f8b561f ("[media] siano: register media controller earlier")
Signed-off-by: Dongliang Mu <dzm91@...t.edu.cn>
---
 drivers/media/usb/siano/smsusb.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/media/usb/siano/smsusb.c b/drivers/media/usb/siano/smsusb.c
index 6f443c542c6d..07c3dd247e48 100644
--- a/drivers/media/usb/siano/smsusb.c
+++ b/drivers/media/usb/siano/smsusb.c
@@ -454,12 +454,7 @@ static int smsusb_init_device(struct usb_interface *intf, int board_id)
 	rc = smscore_register_device(&params, &dev->coredev, 0, mdev);
 	if (rc < 0) {
 		pr_err("smscore_register_device(...) failed, rc %d\n", rc);
-		smsusb_term_device(intf);
-#ifdef CONFIG_MEDIA_CONTROLLER_DVB
-		media_device_unregister(mdev);
-#endif
-		kfree(mdev);
-		return rc;
+		goto err_unregister_device;
 	}
 
 	smscore_set_board_id(dev->coredev, board_id);
@@ -476,8 +471,7 @@ static int smsusb_init_device(struct usb_interface *intf, int board_id)
 	rc = smsusb_start_streaming(dev);
 	if (rc < 0) {
 		pr_err("smsusb_start_streaming(...) failed\n");
-		smsusb_term_device(intf);
-		return rc;
+		goto err_unregister_device;
 	}
 
 	dev->state = SMSUSB_ACTIVE;
@@ -485,13 +479,20 @@ static int smsusb_init_device(struct usb_interface *intf, int board_id)
 	rc = smscore_start_device(dev->coredev);
 	if (rc < 0) {
 		pr_err("smscore_start_device(...) failed\n");
-		smsusb_term_device(intf);
-		return rc;
+		goto err_unregister_device;
 	}
 
 	pr_debug("device 0x%p created\n", dev);
 
 	return rc;
+
+err_unregister_device:
+	smsusb_term_device(intf);
+#ifdef CONFIG_MEDIA_CONTROLLER_DVB
+	media_device_unregister(mdev);
+#endif
+	kfree(mdev);
+	return rc;
 }
 
 static int smsusb_probe(struct usb_interface *intf,
-- 
2.39.1