linux/net/atm/ipcommon.c
David S. Miller 8728b834b2 [NET]: Kill skb->list
Remove the "list" member of struct sk_buff, as it is entirely
redundant.  All SKB list removal callers know which list the
SKB is on, so storing this in sk_buff does nothing other than
taking up some space.

Two tricky bits were SCTP, which I took care of, and two ATM
drivers which Francois Romieu <romieu@fr.zoreil.com> fixed
up.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
2005-08-29 15:31:14 -07:00

58 lines
1.4 KiB
C

/* 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);