[PATCH 4.19 004/338] netdevice: add the case if dev is NULL

[Greg Kroah-Hartman]

From: Yajun Deng <yajun.deng@xxxxxxxxx>

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@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Pavel Machek <pavel@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 include/linux/netdevice.h |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- 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_de
  */
 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