1 /* net/atm/ipcommon.c - Common items for all ways of doing IP over ATM */
2
3 /* Written 1996-2000 by Werner Almesberger, EPFL LRC/ICA */
4
5
6 #include <linux/module.h>
7 #include <linux/string.h>
8 #include <linux/skbuff.h>
9 #include <linux/netdevice.h>
10 #include <linux/in.h>
11 #include <linux/atmdev.h>
12 #include <linux/atmclip.h>
13
14 #include "common.h"
15 #include "ipcommon.h"
16
17
18 #if 0
19 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
20 #else
21 #define DPRINTK(format,args...)
22 #endif
23
24
25 /*
26 * skb_migrate appends the list at "from" to "to", emptying "from" in the
27 * process. skb_migrate is atomic with respect to all other skb operations on
28 * "from" and "to". Note that it locks both lists at the same time, so beware
29 * of potential deadlocks.
30 *
31 * This function should live in skbuff.c or skbuff.h.
32 */
33
34
35 void skb_migrate(struct sk_buff_head *from,struct sk_buff_head *to)
36 {
37 struct sk_buff *skb;
38 unsigned long flags;
39 struct sk_buff *skb_from = (struct sk_buff *) from;
40 struct sk_buff *skb_to = (struct sk_buff *) to;
41 struct sk_buff *prev;
42
43 spin_lock_irqsave(&from->lock,flags);
44 spin_lock(&to->lock);
45 prev = from->prev;
46 from->next->prev = to->prev;
47 prev->next = skb_to;
48 to->prev->next = from->next;
49 to->prev = from->prev;
50 for (skb = from->next; skb != skb_to; skb = skb->next)
51 skb->list = to;
52 to->qlen += from->qlen;
53 spin_unlock(&to->lock);
54 from->prev = skb_from;
55 from->next = skb_from;
56 from->qlen = 0;
57 spin_unlock_irqrestore(&from->lock,flags);
58 }
59
60
61 EXPORT_SYMBOL(skb_migrate);
62
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