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

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Message-Id: <20220414110839.015690473@linuxfoundation.org>
Date:   Thu, 14 Apr 2022 15:08:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yajun Deng <yajun.deng@...ux.dev>,
        "David S. Miller" <davem@...emloft.net>,
        Pavel Machek <pavel@...x.de>
Subject: [PATCH 4.19 004/338] netdevice: add the case if dev is NULL

From: Yajun Deng <yajun.deng@...ux.dev>

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@...ux.dev>
Signed-off-by: David S. Miller <davem@...emloft.net>
Cc: Pavel Machek <pavel@...x.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 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