diff options
Diffstat (limited to 'include/linux/netpoll.h')
| -rw-r--r-- | include/linux/netpoll.h | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h index e9e231215865..95c9f7e16776 100644 --- a/include/linux/netpoll.h +++ b/include/linux/netpoll.h @@ -57,12 +57,15 @@ void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb); #ifdef CONFIG_NETPOLL static inline bool netpoll_rx(struct sk_buff *skb) { - struct netpoll_info *npinfo = skb->dev->npinfo; + struct netpoll_info *npinfo; unsigned long flags; bool ret = false; + rcu_read_lock_bh(); + npinfo = rcu_dereference(skb->dev->npinfo); + if (!npinfo || (list_empty(&npinfo->rx_np) && !npinfo->rx_flags)) - return false; + goto out; spin_lock_irqsave(&npinfo->rx_lock, flags); /* check rx_flags again with the lock held */ @@ -70,12 +73,14 @@ static inline bool netpoll_rx(struct sk_buff *skb) ret = true; spin_unlock_irqrestore(&npinfo->rx_lock, flags); +out: + rcu_read_unlock_bh(); return ret; } static inline int netpoll_rx_on(struct sk_buff *skb) { - struct netpoll_info *npinfo = skb->dev->npinfo; + struct netpoll_info *npinfo = rcu_dereference(skb->dev->npinfo); return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags); } @@ -91,7 +96,6 @@ static inline void *netpoll_poll_lock(struct napi_struct *napi) { struct net_device *dev = napi->dev; - rcu_read_lock(); /* deal with race on ->npinfo */ if (dev && dev->npinfo) { spin_lock(&napi->poll_lock); napi->poll_owner = smp_processor_id(); @@ -108,7 +112,6 @@ static inline void netpoll_poll_unlock(void *have) napi->poll_owner = -1; spin_unlock(&napi->poll_lock); } - rcu_read_unlock(); } #else |