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[ATM]: Kill ipcommon.[ch]

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All that remained was skb_migrate() and that was overkill
for what the two call sites were trying to do.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2006-11-30 21:05:23 -08:00
parent 1e9b3d5339
commit c40a27f48c
5 changed files with 47 additions and 98 deletions
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3
net/atm/Makefile
View file

@ -7,10 +7,7 @@ mpoa-objs := mpc.o mpoa_caches.o mpoa_proc.o
obj-$(CONFIG_ATM) += atm.o
obj-$(CONFIG_ATM_CLIP) += clip.o
atm-$(subst m,y,$(CONFIG_ATM_CLIP)) += ipcommon.o
obj-$(CONFIG_ATM_BR2684) += br2684.o
atm-$(subst m,y,$(CONFIG_ATM_BR2684)) += ipcommon.o
atm-$(subst m,y,$(CONFIG_NET_SCH_ATM)) += ipcommon.o
atm-$(CONFIG_PROC_FS) += proc.o
obj-$(CONFIG_ATM_LANE) += lec.o

28
net/atm/br2684.c
View file

@ -23,7 +23,6 @@ Author: Marcell GAL, 2000, XDSL Ltd, Hungary
#include <linux/atmbr2684.h>
#include "common.h"
#include "ipcommon.h"
/*
* Define this to use a version of the code which interacts with the higher
@ -500,11 +499,12 @@ Note: we do not have explicit unassign, but look at _push()
*/
int err;
struct br2684_vcc *brvcc;
struct sk_buff_head copy;
struct sk_buff *skb;
struct sk_buff_head *rq;
struct br2684_dev *brdev;
struct net_device *net_dev;
struct atm_backend_br2684 be;
unsigned long flags;
if (copy_from_user(&be, arg, sizeof be))
return -EFAULT;
@ -554,12 +554,30 @@ Note: we do not have explicit unassign, but look at _push()
brvcc->old_push = atmvcc->push;
barrier();
atmvcc->push = br2684_push;
skb_queue_head_init(&copy);
skb_migrate(&sk_atm(atmvcc)->sk_receive_queue, &copy);
while ((skb = skb_dequeue(&copy)) != NULL) {
rq = &sk_atm(atmvcc)->sk_receive_queue;
spin_lock_irqsave(&rq->lock, flags);
if (skb_queue_empty(rq)) {
skb = NULL;
} else {
/* NULL terminate the list. */
rq->prev->next = NULL;
skb = rq->next;
}
rq->prev = rq->next = (struct sk_buff *)rq;
rq->qlen = 0;
spin_unlock_irqrestore(&rq->lock, flags);
while (skb) {
struct sk_buff *next = skb->next;
skb->next = skb->prev = NULL;
BRPRIV(skb->dev)->stats.rx_bytes -= skb->len;
BRPRIV(skb->dev)->stats.rx_packets--;
br2684_push(atmvcc, skb);
skb = next;
}
__module_get(THIS_MODULE);
return 0;

29
net/atm/clip.c
View file

@ -38,7 +38,6 @@
#include "common.h"
#include "resources.h"
#include "ipcommon.h"
#include <net/atmclip.h>
@ -469,8 +468,9 @@ static struct net_device_stats *clip_get_stats(struct net_device *dev)
static int clip_mkip(struct atm_vcc *vcc, int timeout)
{
struct clip_vcc *clip_vcc;
struct sk_buff_head copy;
struct sk_buff *skb;
struct sk_buff_head *rq;
unsigned long flags;
if (!vcc->push)
return -EBADFD;
@ -490,10 +490,26 @@ static int clip_mkip(struct atm_vcc *vcc, int timeout)
clip_vcc->old_pop = vcc->pop;
vcc->push = clip_push;
vcc->pop = clip_pop;
skb_queue_head_init(&copy);
skb_migrate(&sk_atm(vcc)->sk_receive_queue, &copy);
rq = &sk_atm(vcc)->sk_receive_queue;
spin_lock_irqsave(&rq->lock, flags);
if (skb_queue_empty(rq)) {
skb = NULL;
} else {
/* NULL terminate the list. */
rq->prev->next = NULL;
skb = rq->next;
}
rq->prev = rq->next = (struct sk_buff *)rq;
rq->qlen = 0;
spin_unlock_irqrestore(&rq->lock, flags);
/* re-process everything received between connection setup and MKIP */
while ((skb = skb_dequeue(&copy)) != NULL)
while (skb) {
struct sk_buff *next = skb->next;
skb->next = skb->prev = NULL;
if (!clip_devs) {
atm_return(vcc, skb->truesize);
kfree_skb(skb);
@ -506,6 +522,9 @@ static int clip_mkip(struct atm_vcc *vcc, int timeout)
PRIV(skb->dev)->stats.rx_bytes -= len;
kfree_skb(skb);
}
skb = next;
}
return 0;
}

63
net/atm/ipcommon.c
View file

@ -1,63 +0,0 @@
/* 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 to deal
* with the lock ordering, the locks are taken in address order.
*
* 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;
if ((unsigned long) from < (unsigned long) to) {
spin_lock_irqsave(&from->lock, flags);
spin_lock_nested(&to->lock, SINGLE_DEPTH_NESTING);
} else {
spin_lock_irqsave(&to->lock, flags);
spin_lock_nested(&from->lock, SINGLE_DEPTH_NESTING);
}
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);

22
net/atm/ipcommon.h
View file

@ -1,22 +0,0 @@
/* net/atm/ipcommon.h - Common items for all ways of doing IP over ATM */
/* Written 1996-2000 by Werner Almesberger, EPFL LRC/ICA */
#ifndef NET_ATM_IPCOMMON_H
#define NET_ATM_IPCOMMON_H
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/atmdev.h>
/*
* Appends all skbs from "from" to "to". The operation is atomic with respect
* to all other skb operations on "from" or "to".
*/
void skb_migrate(struct sk_buff_head *from,struct sk_buff_head *to);
#endif