/* net/atm/ipcommon.c - Common items for all ways of doing IP over ATM */ /* Written 1996-2000 by Werner Almesberger, EPFL LRC/ICA */ #include <linux/module.h> #include <linux/string.h> #include <linux/skbuff.h> #include <linux/netdevice.h> #include <linux/in.h> #include <linux/atmdev.h> #include <linux/atmclip.h> #include "common.h" #include "ipcommon.h" #if 0 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args) #else #define DPRINTK(format,args...) #endif /* * skb_migrate appends the list at "from" to "to", emptying "from" in the * process. skb_migrate is atomic with respect to all other skb operations on * "from" and "to". Note that it locks both lists at the same time, so beware * of potential deadlocks. * * This function should live in skbuff.c or skbuff.h. */ void skb_migrate(struct sk_buff_head *from,struct sk_buff_head *to) { unsigned long flags; struct sk_buff *skb_from = (struct sk_buff *) from; struct sk_buff *skb_to = (struct sk_buff *) to; struct sk_buff *prev; spin_lock_irqsave(&from->lock,flags); spin_lock(&to->lock); prev = from->prev; from->next->prev = to->prev; prev->next = skb_to; to->prev->next = from->next; to->prev = from->prev; to->qlen += from->qlen; spin_unlock(&to->lock); from->prev = skb_from; from->next = skb_from; from->qlen = 0; spin_unlock_irqrestore(&from->lock,flags); } EXPORT_SYMBOL(skb_migrate);