From: Yajun Deng <yajun.deng@linux.dev>
Date: Thu, 5 Aug 2021 11:54:34 +0000 (+0800)
Subject: netdevice: add the case if dev is NULL
X-Git-Tag: v4.19.238~333
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=574a12b4445076a04499962ce8b8ae15f75a7955;p=thirdparty%2Fkernel%2Fstable.git

netdevice: add the case if dev is NULL

commit b37a466837393af72fe8bcb8f1436410f3f173f3 upstream.

Add the case if dev is NULL in dev_{put, hold}, so the caller doesn't
need to care whether dev is NULL or not.

Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Pavel Machek <pavel@denx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 58ee9d2d6a3ca..8d48b352ee74f 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3674,7 +3674,8 @@ void netdev_run_todo(void);
  */
 static inline void dev_put(struct net_device *dev)
 {
-	this_cpu_dec(*dev->pcpu_refcnt);
+	if (dev)
+		this_cpu_dec(*dev->pcpu_refcnt);
 }
 
 /**
@@ -3685,7 +3686,8 @@ static inline void dev_put(struct net_device *dev)
  */
 static inline void dev_hold(struct net_device *dev)
 {
-	this_cpu_inc(*dev->pcpu_refcnt);
+	if (dev)
+		this_cpu_inc(*dev->pcpu_refcnt);
 }
 
 /* Carrier loss detection, dial on demand. The functions netif_carrier_on