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