1 files changed, 47 insertions, 5 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 4307e764ef0a..755e9cddac47 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -604,12 +604,17 @@ static inline __u32 skb_queue_len(const struct sk_buff_head *list_)
         return list_->qlen;
 }
 
-extern struct lock_class_key skb_queue_lock_key;
-
+/*
+ * This function creates a split out lock class for each invocation;
+ * this is needed for now since a whole lot of users of the skb-queue
+ * infrastructure in drivers have different locking usage (in hardirq)
+ * than the networking core (in softirq only). In the long run either the
+ * network layer or drivers should need annotation to consolidate the
+ * main types of usage into 3 classes.
+ */
 static inline void skb_queue_head_init(struct sk_buff_head *list)
 {
         spin_lock_init(&list->lock);
-        lockdep_set_class(&list->lock, &skb_queue_lock_key);
         list->prev = list->next = (struct sk_buff *)list;
         list->qlen = 0;
 }
@@ -1035,6 +1040,21 @@ static inline int pskb_trim(struct sk_buff *skb, unsigned int len)
 }
 
 /**
+ *      pskb_trim_unique - remove end from a paged unique (not cloned) buffer
+ *      @skb: buffer to alter
+ *      @len: new length
+ *
+ *      This is identical to pskb_trim except that the caller knows that
+ *      the skb is not cloned so we should never get an error due to out-
+ *      of-memory.
+ */
+static inline void pskb_trim_unique(struct sk_buff *skb, unsigned int len)
+{
+        int err = pskb_trim(skb, len);
+        BUG_ON(err);
+}
+
+/**
  *      skb_orphan - orphan a buffer
  *      @skb: buffer to orphan
  *
@@ -1076,7 +1096,7 @@ static inline void __skb_queue_purge(struct sk_buff_head *list)
  *      the headroom they think they need without accounting for the
  *      built in space. The built in space is used for optimisations.
  *
- *      %NULL is returned in there is no free memory.
+ *      %NULL is returned if there is no free memory.
  */
 static inline struct sk_buff *__dev_alloc_skb(unsigned int length,
                                               gfp_t gfp_mask)
@@ -1096,7 +1116,7 @@ static inline struct sk_buff *__dev_alloc_skb(unsigned int length,
  *      the headroom they think they need without accounting for the
  *      built in space. The built in space is used for optimisations.
  *
- *      %NULL is returned in there is no free memory. Although this function
+ *      %NULL is returned if there is no free memory. Although this function
  *      allocates memory it can be called from an interrupt.
  */
 static inline struct sk_buff *dev_alloc_skb(unsigned int length)
@@ -1104,6 +1124,28 @@ static inline struct sk_buff *dev_alloc_skb(unsigned int length)
         return __dev_alloc_skb(length, GFP_ATOMIC);
 }
 
+extern struct sk_buff *__netdev_alloc_skb(struct net_device *dev,
+                unsigned int length, gfp_t gfp_mask);
+
+/**
+ *      netdev_alloc_skb - allocate an skbuff for rx on a specific device
+ *      @dev: network device to receive on
+ *      @length: length to allocate
+ *
+ *      Allocate a new &sk_buff and assign it a usage count of one. The
+ *      buffer has unspecified headroom built in. Users should allocate
+ *      the headroom they think they need without accounting for the
+ *      built in space. The built in space is used for optimisations.
+ *
+ *      %NULL is returned if there is no free memory. Although this function
+ *      allocates memory it can be called from an interrupt.
+ */
+static inline struct sk_buff *netdev_alloc_skb(struct net_device *dev,
+                unsigned int length)
+{
+        return __netdev_alloc_skb(dev, length, GFP_ATOMIC);
+}
+
 /**
  *      skb_cow - copy header of skb when it is required
  *      @skb: buffer to cow