SCTP: Convert custom hash lists to use hlist.

Convert the custom hash list traversals to use hlist functions.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>

7 files changed, 32 insertions, 53 deletions

diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index 70827305f501..67c997cecf58 100644
--- a/include/net/sctp/sctp.h
+++ b/include/net/sctp/sctp.h
@@ -665,6 +665,9 @@ static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
         return (h & (sctp_assoc_hashsize-1));
 }
 
+#define sctp_for_each_hentry(epb, node, head) \
+        hlist_for_each_entry(epb, node, head, node)
+
 /* Is a socket of this style? */
 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 44f2672859e2..eb3113c38a94 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -100,20 +100,19 @@ struct crypto_hash;
 struct sctp_bind_bucket {
         unsigned short  port;
         unsigned short  fastreuse;
-        struct sctp_bind_bucket *next;
-        struct sctp_bind_bucket **pprev;
+        struct hlist_node       node;
         struct hlist_head       owner;
 };
 
 struct sctp_bind_hashbucket {
         spinlock_t      lock;
-        struct sctp_bind_bucket *chain;
+        struct hlist_head       chain;
 };
 
 /* Used for hashing all associations.  */
 struct sctp_hashbucket {
         rwlock_t        lock;
-        struct sctp_ep_common  *chain;
+        struct hlist_head       chain;
 } __attribute__((__aligned__(8)));
 
 
@@ -1230,8 +1229,7 @@ typedef enum {
 
 struct sctp_ep_common {
         /* Fields to help us manage our entries in the hash tables. */
-        struct sctp_ep_common *next;
-        struct sctp_ep_common **pprev;
+        struct hlist_node node;
         int hashent;
 
         /* Runtime type information.  What kind of endpoint is this? */
diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
index 68f0556efcc6..de6f505d6ff8 100644
--- a/net/sctp/endpointola.c
+++ b/net/sctp/endpointola.c
@@ -332,6 +332,7 @@ static struct sctp_association *__sctp_endpoint_lookup_assoc(
         struct sctp_transport *t = NULL;
         struct sctp_hashbucket *head;
         struct sctp_ep_common *epb;
+        struct hlist_node *node;
         int hash;
         int rport;
 
@@ -341,7 +342,7 @@ static struct sctp_association *__sctp_endpoint_lookup_assoc(
         hash = sctp_assoc_hashfn(ep->base.bind_addr.port, rport);
         head = &sctp_assoc_hashtable[hash];
         read_lock(&head->lock);
-        for (epb = head->chain; epb; epb = epb->next) {
+        sctp_for_each_hentry(epb, node, &head->chain) {
                 asoc = sctp_assoc(epb);
                 if (asoc->ep != ep || rport != asoc->peer.port)
                         goto next;
diff --git a/net/sctp/input.c b/net/sctp/input.c
index 86503e7fa21e..91ae463b079b 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -656,7 +656,6 @@ discard:
 /* Insert endpoint into the hash table.  */
 static void __sctp_hash_endpoint(struct sctp_endpoint *ep)
 {
-        struct sctp_ep_common **epp;
         struct sctp_ep_common *epb;
         struct sctp_hashbucket *head;
 
@@ -666,12 +665,7 @@ static void __sctp_hash_endpoint(struct sctp_endpoint *ep)
         head = &sctp_ep_hashtable[epb->hashent];
 
         sctp_write_lock(&head->lock);
-        epp = &head->chain;
-        epb->next = *epp;
-        if (epb->next)
-                (*epp)->pprev = &epb->next;
-        *epp = epb;
-        epb->pprev = epp;
+        hlist_add_head(&epb->node, &head->chain);
         sctp_write_unlock(&head->lock);
 }
 
@@ -691,19 +685,15 @@ static void __sctp_unhash_endpoint(struct sctp_endpoint *ep)
 
         epb = &ep->base;
 
+        if (hlist_unhashed(&epb->node))
+                return;
+
         epb->hashent = sctp_ep_hashfn(epb->bind_addr.port);
 
         head = &sctp_ep_hashtable[epb->hashent];
 
         sctp_write_lock(&head->lock);
-
-        if (epb->pprev) {
-                if (epb->next)
-                        epb->next->pprev = epb->pprev;
-                *epb->pprev = epb->next;
-                epb->pprev = NULL;
-        }
-
+        __hlist_del(&epb->node);
         sctp_write_unlock(&head->lock);
 }
 
@@ -721,12 +711,13 @@ static struct sctp_endpoint *__sctp_rcv_lookup_endpoint(const union sctp_addr *l
         struct sctp_hashbucket *head;
         struct sctp_ep_common *epb;
         struct sctp_endpoint *ep;
+        struct hlist_node *node;
         int hash;
 
         hash = sctp_ep_hashfn(ntohs(laddr->v4.sin_port));
         head = &sctp_ep_hashtable[hash];
         read_lock(&head->lock);
-        for (epb = head->chain; epb; epb = epb->next) {
+        sctp_for_each_hentry(epb, node, &head->chain) {
                 ep = sctp_ep(epb);
                 if (sctp_endpoint_is_match(ep, laddr))
                         goto hit;
@@ -744,7 +735,6 @@ hit:
 /* Insert association into the hash table.  */
 static void __sctp_hash_established(struct sctp_association *asoc)
 {
-        struct sctp_ep_common **epp;
         struct sctp_ep_common *epb;
         struct sctp_hashbucket *head;
 
@@ -756,12 +746,7 @@ static void __sctp_hash_established(struct sctp_association *asoc)
         head = &sctp_assoc_hashtable[epb->hashent];
 
         sctp_write_lock(&head->lock);
-        epp = &head->chain;
-        epb->next = *epp;
-        if (epb->next)
-                (*epp)->pprev = &epb->next;
-        *epp = epb;
-        epb->pprev = epp;
+        hlist_add_head(&epb->node, &head->chain);
         sctp_write_unlock(&head->lock);
 }
 
@@ -790,14 +775,7 @@ static void __sctp_unhash_established(struct sctp_association *asoc)
         head = &sctp_assoc_hashtable[epb->hashent];
 
         sctp_write_lock(&head->lock);
-
-        if (epb->pprev) {
-                if (epb->next)
-                        epb->next->pprev = epb->pprev;
-                *epb->pprev = epb->next;
-                epb->pprev = NULL;
-        }
-
+        __hlist_del(&epb->node);
         sctp_write_unlock(&head->lock);
 }
 
@@ -822,6 +800,7 @@ static struct sctp_association *__sctp_lookup_association(
         struct sctp_ep_common *epb;
         struct sctp_association *asoc;
         struct sctp_transport *transport;
+        struct hlist_node *node;
         int hash;
 
         /* Optimize here for direct hit, only listening connections can
@@ -830,7 +809,7 @@ static struct sctp_association *__sctp_lookup_association(
         hash = sctp_assoc_hashfn(ntohs(local->v4.sin_port), ntohs(peer->v4.sin_port));
         head = &sctp_assoc_hashtable[hash];
         read_lock(&head->lock);
-        for (epb = head->chain; epb; epb = epb->next) {
+        sctp_for_each_hentry(epb, node, &head->chain) {
                 asoc = sctp_assoc(epb);
                 transport = sctp_assoc_is_match(asoc, local, peer);
                 if (transport)
diff --git a/net/sctp/proc.c b/net/sctp/proc.c
index e4cd841a22e4..249973204070 100644
--- a/net/sctp/proc.c
+++ b/net/sctp/proc.c
@@ -225,6 +225,7 @@ static int sctp_eps_seq_show(struct seq_file *seq, void *v)
         struct sctp_ep_common *epb;
         struct sctp_endpoint *ep;
         struct sock *sk;
+        struct hlist_node *node;
         int    hash = *(loff_t *)v;
 
         if (hash >= sctp_ep_hashsize)
@@ -233,7 +234,7 @@ static int sctp_eps_seq_show(struct seq_file *seq, void *v)
         head = &sctp_ep_hashtable[hash];
         sctp_local_bh_disable();
         read_lock(&head->lock);
-        for (epb = head->chain; epb; epb = epb->next) {
+        sctp_for_each_hentry(epb, node, &head->chain) {
                 ep = sctp_ep(epb);
                 sk = epb->sk;
                 seq_printf(seq, "%8p %8p %-3d %-3d %-4d %-5d %5d %5lu ", ep, sk,
@@ -328,6 +329,7 @@ static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
         struct sctp_ep_common *epb;
         struct sctp_association *assoc;
         struct sock *sk;
+        struct hlist_node *node;
         int    hash = *(loff_t *)v;
 
         if (hash >= sctp_assoc_hashsize)
@@ -336,7 +338,7 @@ static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
         head = &sctp_assoc_hashtable[hash];
         sctp_local_bh_disable();
         read_lock(&head->lock);
-        for (epb = head->chain; epb; epb = epb->next) {
+        sctp_for_each_hentry(epb, node, &head->chain) {
                 assoc = sctp_assoc(epb);
                 sk = epb->sk;
                 seq_printf(seq,
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index ecfab0344e73..d50f610d1b02 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -1137,7 +1137,7 @@ SCTP_STATIC __init int sctp_init(void)
         }
         for (i = 0; i < sctp_assoc_hashsize; i++) {
                 rwlock_init(&sctp_assoc_hashtable[i].lock);
-                sctp_assoc_hashtable[i].chain = NULL;
+                INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
         }
 
         /* Allocate and initialize the endpoint hash table.  */
@@ -1151,7 +1151,7 @@ SCTP_STATIC __init int sctp_init(void)
         }
         for (i = 0; i < sctp_ep_hashsize; i++) {
                 rwlock_init(&sctp_ep_hashtable[i].lock);
-                sctp_ep_hashtable[i].chain = NULL;
+                INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
         }
 
         /* Allocate and initialize the SCTP port hash table.  */
@@ -1170,7 +1170,7 @@ SCTP_STATIC __init int sctp_init(void)
         }
         for (i = 0; i < sctp_port_hashsize; i++) {
                 spin_lock_init(&sctp_port_hashtable[i].lock);
-                sctp_port_hashtable[i].chain = NULL;
+                INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
         }
 
         printk(KERN_INFO "SCTP: Hash tables configured "
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 6ce9b490fad5..ff8bc95670ed 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5307,6 +5307,7 @@ static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
 {
         struct sctp_bind_hashbucket *head; /* hash list */
         struct sctp_bind_bucket *pp; /* hash list port iterator */
+        struct hlist_node *node;
         unsigned short snum;
         int ret;
 
@@ -5331,7 +5332,7 @@ static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
                         index = sctp_phashfn(rover);
                         head = &sctp_port_hashtable[index];
                         sctp_spin_lock(&head->lock);
-                        for (pp = head->chain; pp; pp = pp->next)
+                        sctp_for_each_hentry(pp, node, &head->chain)
                                 if (pp->port == rover)
                                         goto next;
                         break;
@@ -5358,7 +5359,7 @@ static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
                  */
                 head = &sctp_port_hashtable[sctp_phashfn(snum)];
                 sctp_spin_lock(&head->lock);
-                for (pp = head->chain; pp; pp = pp->next) {
+                sctp_for_each_hentry(pp, node, &head->chain) {
                         if (pp->port == snum)
                                 goto pp_found;
                 }
@@ -5702,10 +5703,7 @@ static struct sctp_bind_bucket *sctp_bucket_create(
                 pp->port = snum;
                 pp->fastreuse = 0;
                 INIT_HLIST_HEAD(&pp->owner);
-                if ((pp->next = head->chain) != NULL)
-                        pp->next->pprev = &pp->next;
-                head->chain = pp;
-                pp->pprev = &head->chain;
+                hlist_add_head(&pp->node, &head->chain);
         }
         return pp;
 }
@@ -5714,9 +5712,7 @@ static struct sctp_bind_bucket *sctp_bucket_create(
 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
 {
         if (pp && hlist_empty(&pp->owner)) {
-                if (pp->next)
-                        pp->next->pprev = pp->pprev;
-                *(pp->pprev) = pp->next;
+                __hlist_del(&pp->node);
                 kmem_cache_free(sctp_bucket_cachep, pp);
                 SCTP_DBG_OBJCNT_DEC(bind_bucket);
         }