[ATM]: Kill ipcommon.[ch]

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>

5 files changed, 47 insertions, 98 deletions

diff --git a/net/atm/Makefile b/net/atm/Makefile
index 89656d6c0b90..cc50bd1ff1de 100644
--- a/net/atm/Makefile
+++ b/net/atm/Makefile
@@ -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
diff --git a/net/atm/br2684.c b/net/atm/br2684.c
index b04162f10d85..83a1c1b1d6cd 100644
--- a/net/atm/br2684.c
+++ b/net/atm/br2684.c
@@ -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;
diff --git a/net/atm/clip.c b/net/atm/clip.c
index 1c416934b7c1..5f8a1d222720 100644
--- a/net/atm/clip.c
+++ b/net/atm/clip.c
@@ -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;
 }
 
diff --git a/net/atm/ipcommon.c b/net/atm/ipcommon.c
deleted file mode 100644
index 1d3de42fada0..000000000000
--- a/net/atm/ipcommon.c
+++ /dev/null
@@ -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);
diff --git a/net/atm/ipcommon.h b/net/atm/ipcommon.h
deleted file mode 100644
index d72165f60939..000000000000
--- a/net/atm/ipcommon.h
+++ /dev/null
@@ -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