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netdevice: add the case if dev is NULL

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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>
This commit is contained in:
Yajun Deng 2021-08-05 19:54:34 +08:00 committed by David S. Miller
parent 1160dfa178
commit b37a466837
1 changed files with 8 additions and 4 deletions
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4
include/linux/netdevice.h
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@ -4143,12 +4143,14 @@ 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);
#else
refcount_dec(&dev->dev_refcnt);
#endif
}
}
/**
* dev_hold - get reference to device
@ -4158,12 +4160,14 @@ 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);
#else
refcount_inc(&dev->dev_refcnt);
#endif
}
}
/* Carrier loss detection, dial on demand. The functions netif_carrier_on
* and _off may be called from IRQ context, but it is caller