diff options
| -rw-r--r-- | drivers/net/ppp/ppp_generic.c | 52 |
1 files changed, 40 insertions, 12 deletions
diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c index 70cfa06ccd40..57fc550aa14b 100644 --- a/drivers/net/ppp/ppp_generic.c +++ b/drivers/net/ppp/ppp_generic.c @@ -1376,12 +1376,8 @@ static void ppp_setup(struct net_device *dev) * Transmit-side routines. */ -/* - * Called to do any work queued up on the transmit side - * that can now be done. - */ -static void -ppp_xmit_process(struct ppp *ppp) +/* Called to do any work queued up on the transmit side that can now be done */ +static void __ppp_xmit_process(struct ppp *ppp) { struct sk_buff *skb; @@ -1401,6 +1397,30 @@ ppp_xmit_process(struct ppp *ppp) ppp_xmit_unlock(ppp); } +static DEFINE_PER_CPU(int, ppp_xmit_recursion); + +static void ppp_xmit_process(struct ppp *ppp) +{ + local_bh_disable(); + + if (unlikely(__this_cpu_read(ppp_xmit_recursion))) + goto err; + + __this_cpu_inc(ppp_xmit_recursion); + __ppp_xmit_process(ppp); + __this_cpu_dec(ppp_xmit_recursion); + + local_bh_enable(); + + return; + +err: + local_bh_enable(); + + if (net_ratelimit()) + netdev_err(ppp->dev, "recursion detected\n"); +} + static inline struct sk_buff * pad_compress_skb(struct ppp *ppp, struct sk_buff *skb) { @@ -1856,11 +1876,8 @@ static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb) } #endif /* CONFIG_PPP_MULTILINK */ -/* - * Try to send data out on a channel. - */ -static void -ppp_channel_push(struct channel *pch) +/* Try to send data out on a channel */ +static void __ppp_channel_push(struct channel *pch) { struct sk_buff *skb; struct ppp *ppp; @@ -1885,11 +1902,22 @@ ppp_channel_push(struct channel *pch) read_lock_bh(&pch->upl); ppp = pch->ppp; if (ppp) - ppp_xmit_process(ppp); + __ppp_xmit_process(ppp); read_unlock_bh(&pch->upl); } } +static void ppp_channel_push(struct channel *pch) +{ + local_bh_disable(); + + __this_cpu_inc(ppp_xmit_recursion); + __ppp_channel_push(pch); + __this_cpu_dec(ppp_xmit_recursion); + + local_bh_enable(); +} + /* * Receive-side routines. */ |