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: accepted/tizen/unified/20230118.172025~6527^2~275
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b37a466837393af72fe8bcb8f1436410f3f173f3;p=platform%2Fkernel%2Flinux-rpi.git

netdevice: add the case if dev is NULL

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>
---

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 1b4d450..135c943 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -4143,11 +4143,13 @@ void netdev_run_todo(void);
  */
 static inline void dev_put(struct net_device *dev)
 {
+	if (dev) {
 #ifdef CONFIG_PCPU_DEV_REFCNT
-	this_cpu_dec(*dev->pcpu_refcnt);
+		this_cpu_dec(*dev->pcpu_refcnt);
 #else
-	refcount_dec(&dev->dev_refcnt);
+		refcount_dec(&dev->dev_refcnt);
 #endif
+	}
 }
 
 /**
@@ -4158,11 +4160,13 @@ static inline void dev_put(struct net_device *dev)
  */
 static inline void dev_hold(struct net_device *dev)
 {
+	if (dev) {
 #ifdef CONFIG_PCPU_DEV_REFCNT
-	this_cpu_inc(*dev->pcpu_refcnt);
+		this_cpu_inc(*dev->pcpu_refcnt);
 #else
-	refcount_inc(&dev->dev_refcnt);
+		refcount_inc(&dev->dev_refcnt);
 #endif
+	}
 }
 
 /* Carrier loss detection, dial on demand. The functions netif_carrier_on