1 files changed, 20 insertions, 4 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index fe2c58e5306f..830f58fa03a2 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1169,18 +1169,34 @@ 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;
 }
 
 /**