caif: Fixes freeze on Link layer removal.

CAIF Socket layer - caif_socket.c:
- Plug mem-leak at reconnect.
- Always call disconnect to cleanup CAIF stack.
- Disconnect will always report success.

CAIF configuration layer - cfcnfg.c
- Disconnect must dismantle the caif stack correctly
- Protect against faulty removals (check on id zero)

CAIF mux layer - cfmuxl.c
- When inserting new service layer in the MUX remove
  any old entries with the same ID.
- When removing CAIF Link layer, remove the associated
  service layers before notifying service layers.

Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 38 insertions, 11 deletions

diff --git a/net/caif/cfmuxl.c b/net/caif/cfmuxl.c
index 2a56df7e0a4b..3a66b8c10e09 100644
--- a/net/caif/cfmuxl.c
+++ b/net/caif/cfmuxl.c
@@ -62,16 +62,6 @@ struct cflayer *cfmuxl_create(void)
         return &this->layer;
 }
 
-int cfmuxl_set_uplayer(struct cflayer *layr, struct cflayer *up, u8 linkid)
-{
-        struct cfmuxl *muxl = container_obj(layr);
-
-        spin_lock_bh(&muxl->receive_lock);
-        list_add_rcu(&up->node, &muxl->srvl_list);
-        spin_unlock_bh(&muxl->receive_lock);
-        return 0;
-}
-
 int cfmuxl_set_dnlayer(struct cflayer *layr, struct cflayer *dn, u8 phyid)
 {
         struct cfmuxl *muxl = (struct cfmuxl *) layr;
@@ -93,6 +83,24 @@ static struct cflayer *get_from_id(struct list_head *list, u16 id)
         return NULL;
 }
 
+int cfmuxl_set_uplayer(struct cflayer *layr, struct cflayer *up, u8 linkid)
+{
+        struct cfmuxl *muxl = container_obj(layr);
+        struct cflayer *old;
+
+        spin_lock_bh(&muxl->receive_lock);
+
+        /* Two entries with same id is wrong, so remove old layer from mux */
+        old = get_from_id(&muxl->srvl_list, linkid);
+        if (old != NULL)
+                list_del_rcu(&old->node);
+
+        list_add_rcu(&up->node, &muxl->srvl_list);
+        spin_unlock_bh(&muxl->receive_lock);
+
+        return 0;
+}
+
 struct cflayer *cfmuxl_remove_dnlayer(struct cflayer *layr, u8 phyid)
 {
         struct cfmuxl *muxl = container_obj(layr);
@@ -146,6 +154,11 @@ struct cflayer *cfmuxl_remove_uplayer(struct cflayer *layr, u8 id)
         struct cfmuxl *muxl = container_obj(layr);
         int idx = id % UP_CACHE_SIZE;
 
+        if (id == 0) {
+                pr_warn("Trying to remove control layer\n");
+                return NULL;
+        }
+
         spin_lock_bh(&muxl->receive_lock);
         up = get_from_id(&muxl->srvl_list, id);
         if (up == NULL)
@@ -235,12 +248,26 @@ static void cfmuxl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
 {
         struct cfmuxl *muxl = container_obj(layr);
         struct cflayer *layer;
+        int idx;
 
         rcu_read_lock();
         list_for_each_entry_rcu(layer, &muxl->srvl_list, node) {
-                if (cfsrvl_phyid_match(layer, phyid) && layer->ctrlcmd)
+
+                if (cfsrvl_phyid_match(layer, phyid) && layer->ctrlcmd) {
+
+                        if ((ctrl == _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND ||
+                                ctrl == CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND) &&
+                                        layer->id != 0) {
+
+                                idx = layer->id % UP_CACHE_SIZE;
+                                spin_lock_bh(&muxl->receive_lock);
+                                rcu_assign_pointer(muxl->up_cache[idx], NULL);
+                                list_del_rcu(&layer->node);
+                                spin_unlock_bh(&muxl->receive_lock);
+                        }
                         /* NOTE: ctrlcmd is not allowed to block */
                         layer->ctrlcmd(layer, ctrl, phyid);
+                }
         }
         rcu_read_unlock();
 }