[PATCH] USB: make endpoints real struct devices

[linux-2.6] / include / linux / skbuff.h

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index fe2c58e5306fc8b9e0b2ef6cddee4317f15ec047..66f8819f9568d0f248b363d65478c8b660962c35 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -14,7 +14,6 @@
 #ifndef _LINUX_SKBUFF_H
 #define _LINUX_SKBUFF_H
 
-#include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/compiler.h>
 #include <linux/time.h>
@@ -975,15 +974,16 @@ static inline void skb_reserve(struct sk_buff *skb, int len)
 #define NET_SKB_PAD    16
 #endif
 
-extern int ___pskb_trim(struct sk_buff *skb, unsigned int len, int realloc);
+extern int ___pskb_trim(struct sk_buff *skb, unsigned int len);
 
 static inline void __skb_trim(struct sk_buff *skb, unsigned int len)
 {
-       if (!skb->data_len) {
-               skb->len  = len;
-               skb->tail = skb->data + len;
-       } else
-               ___pskb_trim(skb, len, 0);
+       if (unlikely(skb->data_len)) {
+               WARN_ON(1);
+               return;
+       }
+       skb->len  = len;
+       skb->tail = skb->data + len;
 }
 
 /**
@@ -993,6 +993,7 @@ static inline void __skb_trim(struct sk_buff *skb, unsigned int len)
  *
  *     Cut the length of a buffer down by removing data from the tail. If
  *     the buffer is already under the length specified it is not modified.
+ *     The skb must be linear.
  */
 static inline void skb_trim(struct sk_buff *skb, unsigned int len)
 {
@@ -1003,12 +1004,10 @@ static inline void skb_trim(struct sk_buff *skb, unsigned int len)
 
 static inline int __pskb_trim(struct sk_buff *skb, unsigned int len)
 {
-       if (!skb->data_len) {
-               skb->len  = len;
-               skb->tail = skb->data+len;
-               return 0;
-       }
-       return ___pskb_trim(skb, len, 1);
+       if (skb->data_len)
+               return ___pskb_trim(skb, len);
+       __skb_trim(skb, len);
+       return 0;
 }
 
 static inline int pskb_trim(struct sk_buff *skb, unsigned int len)
@@ -1169,18 +1168,34 @@ static inline int skb_can_coalesce(struct sk_buff *skb, int i,
        return 0;
 }
 
+static inline int __skb_linearize(struct sk_buff *skb)
+{
+       return __pskb_pull_tail(skb, skb->data_len) ? 0 : -ENOMEM;
+}
+
 /**
  *     skb_linearize - convert paged skb to linear one
  *     @skb: buffer to linarize
- *     @gfp: allocation mode
  *
  *     If there is no free memory -ENOMEM is returned, otherwise zero
  *     is returned and the old skb data released.
  */
-extern int __skb_linearize(struct sk_buff *skb, gfp_t gfp);
-static inline int skb_linearize(struct sk_buff *skb, gfp_t gfp)
+static inline int skb_linearize(struct sk_buff *skb)
+{
+       return skb_is_nonlinear(skb) ? __skb_linearize(skb) : 0;
+}
+
+/**
+ *     skb_linearize_cow - make sure skb is linear and writable
+ *     @skb: buffer to process
+ *
+ *     If there is no free memory -ENOMEM is returned, otherwise zero
+ *     is returned and the old skb data released.
+ */
+static inline int skb_linearize_cow(struct sk_buff *skb)
 {
-       return __skb_linearize(skb, gfp);
+       return skb_is_nonlinear(skb) || skb_cloned(skb) ?
+              __skb_linearize(skb) : 0;
 }
 
 /**