[PATCH 4.14 003/284] netdevice: add the case if dev is NULL

Greg Kroah-Hartman
2022-04-18T13:32:10Z

From: Yajun Deng <yajun.deng@linux.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@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>
---
include/linux/netdevice.h | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3378,7 +3378,8 @@ 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);
}

/**
@@ -3389,7 +3390,8 @@ 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