linux-kernel - [PATCH] staging: rtl8712: add error handling for register

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Date:   Tue, 12 Jun 2018 11:18:43 +0800
From:   Zhouyang Jia <jiazhouyang09@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Zhouyang Jia <jiazhouyang09@...il.com>,
        Larry Finger <Larry.Finger@...inger.net>,
        Florian Schilhabel <florian.c.schilhabel@...glemail.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Liam Ryan <liamryandev@...il.com>,
        Colin Ian King <colin.king@...onical.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH] staging: rtl8712: add error handling for register_netdev

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

This patch adds error-handling code after calling register_netdev.

Signed-off-by: Zhouyang Jia <jiazhouyang09@...il.com>
---
 drivers/staging/rtl8712/hal_init.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8712/hal_init.c b/drivers/staging/rtl8712/hal_init.c
index 2a3f074..2b47e75 100644
--- a/drivers/staging/rtl8712/hal_init.c
+++ b/drivers/staging/rtl8712/hal_init.c
@@ -40,6 +40,7 @@
 static void rtl871x_load_fw_cb(const struct firmware *firmware, void *context)
 {
 	struct _adapter *padapter = context;
+	int rc;
 
 	complete(&padapter->rtl8712_fw_ready);
 	if (!firmware) {
@@ -53,7 +54,12 @@ static void rtl871x_load_fw_cb(const struct firmware *firmware, void *context)
 	}
 	padapter->fw = firmware;
 	/* firmware available - start netdev */
-	register_netdev(padapter->pnetdev);
+	rc = register_netdev(padapter->pnetdev);
+	if (rc) {
+		struct usb_device *udev = padapter->dvobjpriv.pusbdev;
+
+		dev_err(&udev->dev, "r8712u: Unable to register netdev\n");
+	}
 }
 
 static const char firmware_file[] = "rtlwifi/rtl8712u.bin";
-- 
2.7.4