net: remove unused struct inet_frag_queue.fragments field

Now that all users of struct inet_frag_queue have been converted
to use 'rb_fragments', remove the unused 'fragments' field.

Build with `make allyesconfig` succeeded. ip_defrag selftest passed.

Signed-off-by: Peter Oskolkov <posk@google.com>
Acked-by: Stefan Schmidt <stefan@datenfreihafen.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 14 insertions, 39 deletions

diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index b02bf737d019..378904ee9129 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -56,7 +56,6 @@ struct frag_v6_compare_key {
  * @timer: queue expiration timer
  * @lock: spinlock protecting this frag
  * @refcnt: reference count of the queue
- * @fragments: received fragments head
  * @rb_fragments: received fragments rb-tree root
  * @fragments_tail: received fragments tail
  * @last_run_head: the head of the last "run". see ip_fragment.c
@@ -77,8 +76,7 @@ struct inet_frag_queue {
         struct timer_list       timer;
         spinlock_t              lock;
         refcount_t              refcnt;
-        struct sk_buff          *fragments;  /* used in 6lopwpan IPv6. */
-        struct rb_root          rb_fragments; /* Used in IPv4/IPv6. */
+        struct rb_root          rb_fragments;
         struct sk_buff          *fragments_tail;
         struct sk_buff          *last_run_head;
         ktime_t                 stamp;
diff --git a/net/ieee802154/6lowpan/reassembly.c b/net/ieee802154/6lowpan/reassembly.c
index bd61633d2c32..4196bcd4105a 100644
--- a/net/ieee802154/6lowpan/reassembly.c
+++ b/net/ieee802154/6lowpan/reassembly.c
@@ -179,7 +179,6 @@ static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, struct sk_buff *skb,
 
         skb->dev = ldev;
         skb->tstamp = fq->q.stamp;
-        fq->q.fragments = NULL;
         fq->q.rb_fragments = RB_ROOT;
         fq->q.fragments_tail = NULL;
         fq->q.last_run_head = NULL;
diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
index 9f69411251d0..737808e27f8b 100644
--- a/net/ipv4/inet_fragment.c
+++ b/net/ipv4/inet_fragment.c
@@ -203,7 +203,6 @@ EXPORT_SYMBOL(inet_frag_rbtree_purge);
 
 void inet_frag_destroy(struct inet_frag_queue *q)
 {
-        struct sk_buff *fp;
         struct netns_frags *nf;
         unsigned int sum, sum_truesize = 0;
         struct inet_frags *f;
@@ -212,20 +211,9 @@ void inet_frag_destroy(struct inet_frag_queue *q)
         WARN_ON(del_timer(&q->timer) != 0);
 
         /* Release all fragment data. */
-        fp = q->fragments;
         nf = q->net;
         f = nf->f;
-        if (fp) {
-                do {
-                        struct sk_buff *xp = fp->next;
-
-                        sum_truesize += fp->truesize;
-                        kfree_skb(fp);
-                        fp = xp;
-                } while (fp);
-        } else {
-                sum_truesize = inet_frag_rbtree_purge(&q->rb_fragments);
-        }
+        sum_truesize = inet_frag_rbtree_purge(&q->rb_fragments);
         sum = sum_truesize + f->qsize;
 
         call_rcu(&q->rcu, inet_frag_destroy_rcu);
@@ -489,26 +477,20 @@ EXPORT_SYMBOL(inet_frag_reasm_finish);
 
 struct sk_buff *inet_frag_pull_head(struct inet_frag_queue *q)
 {
-        struct sk_buff *head;
+        struct sk_buff *head, *skb;
 
-        if (q->fragments) {
-                head = q->fragments;
-                q->fragments = head->next;
-        } else {
-                struct sk_buff *skb;
+        head = skb_rb_first(&q->rb_fragments);
+        if (!head)
+                return NULL;
+        skb = FRAG_CB(head)->next_frag;
+        if (skb)
+                rb_replace_node(&head->rbnode, &skb->rbnode,
+                                &q->rb_fragments);
+        else
+                rb_erase(&head->rbnode, &q->rb_fragments);
+        memset(&head->rbnode, 0, sizeof(head->rbnode));
+        barrier();
 
-                head = skb_rb_first(&q->rb_fragments);
-                if (!head)
-                        return NULL;
-                skb = FRAG_CB(head)->next_frag;
-                if (skb)
-                        rb_replace_node(&head->rbnode, &skb->rbnode,
-                                        &q->rb_fragments);
-                else
-                        rb_erase(&head->rbnode, &q->rb_fragments);
-                memset(&head->rbnode, 0, sizeof(head->rbnode));
-                barrier();
-        }
         if (head == q->fragments_tail)
                 q->fragments_tail = NULL;
 
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 486ecb0aeb87..cf2b0a6a3337 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -261,7 +261,6 @@ static int ip_frag_reinit(struct ipq *qp)
         qp->q.flags = 0;
         qp->q.len = 0;
         qp->q.meat = 0;
-        qp->q.fragments = NULL;
         qp->q.rb_fragments = RB_ROOT;
         qp->q.fragments_tail = NULL;
         qp->q.last_run_head = NULL;
@@ -451,7 +450,6 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *skb,
         ip_send_check(iph);
 
         __IP_INC_STATS(net, IPSTATS_MIB_REASMOKS);
-        qp->q.fragments = NULL;
         qp->q.rb_fragments = RB_ROOT;
         qp->q.fragments_tail = NULL;
         qp->q.last_run_head = NULL;
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index cb1b4772dac0..3de0e9b0a482 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -365,7 +365,6 @@ static int nf_ct_frag6_reasm(struct frag_queue *fq, struct sk_buff *skb,
                                          skb_network_header_len(skb),
                                          skb->csum);
 
-        fq->q.fragments = NULL;
         fq->q.rb_fragments = RB_ROOT;
         fq->q.fragments_tail = NULL;
         fq->q.last_run_head = NULL;
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 24264d0a4b85..1a832f5e190b 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -304,7 +304,6 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *skb,
         rcu_read_lock();
         __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
         rcu_read_unlock();
-        fq->q.fragments = NULL;
         fq->q.rb_fragments = RB_ROOT;
         fq->q.fragments_tail = NULL;
         fq->q.last_run_head = NULL;