linux-kernel - [PATCH] media: tm6000: add error handling for dvb_register

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Date:   Mon, 11 Jun 2018 12:39:20 +0800
From:   Zhouyang Jia <jiazhouyang09@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Zhouyang Jia <jiazhouyang09@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Markus Elfring <elfring@...rs.sourceforge.net>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Colin Ian King <colin.king@...onical.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: tm6000: add error handling for dvb_register_adapter

When dvb_register_adapter fails, the lack of error-handling code may
cause unexpected results.

This patch adds error-handling code after calling dvb_register_adapter.

Signed-off-by: Zhouyang Jia <jiazhouyang09@...il.com>
---
 drivers/media/usb/tm6000/tm6000-dvb.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/media/usb/tm6000/tm6000-dvb.c b/drivers/media/usb/tm6000/tm6000-dvb.c
index c811fc6..ff35d4b 100644
--- a/drivers/media/usb/tm6000/tm6000-dvb.c
+++ b/drivers/media/usb/tm6000/tm6000-dvb.c
@@ -266,6 +266,11 @@ static int register_dvb(struct tm6000_core *dev)
 
 	ret = dvb_register_adapter(&dvb->adapter, "Trident TVMaster 6000 DVB-T",
 					THIS_MODULE, &dev->udev->dev, adapter_nr);
+	if (ret < 0) {
+		printk(KERN_ERR "tm6000: couldn't register the adater!\n");
+		goto err;
+	}
+
 	dvb->adapter.priv = dev;
 
 	if (dvb->frontend) {
-- 
2.7.4