caif: Add reference counting to service layer

Changes:
o Added functions cfsrvl_get and cfsrvl_put.
o Added support release_client to use by socket and net device.
o Increase reference counting for in-flight packets from cfmuxl

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

1 files changed, 6 insertions, 1 deletions

diff --git a/net/caif/cfmuxl.c b/net/caif/cfmuxl.c
index 6fb9f9e96cf8..7372f27f1d32 100644
--- a/net/caif/cfmuxl.c
+++ b/net/caif/cfmuxl.c
@@ -62,6 +62,7 @@ int cfmuxl_set_uplayer(struct cflayer *layr, struct cflayer *up, u8 linkid)
 {
         struct cfmuxl *muxl = container_obj(layr);
         spin_lock(&muxl->receive_lock);
+        cfsrvl_get(up);
         list_add(&up->node, &muxl->srvl_list);
         spin_unlock(&muxl->receive_lock);
         return 0;
@@ -172,8 +173,11 @@ struct cflayer *cfmuxl_remove_uplayer(struct cflayer *layr, u8 id)
         struct cfmuxl *muxl = container_obj(layr);
         spin_lock(&muxl->receive_lock);
         up = get_up(muxl, id);
+        if (up == NULL)
+                return NULL;
         memset(muxl->up_cache, 0, sizeof(muxl->up_cache));
         list_del(&up->node);
+        cfsrvl_put(up);
         spin_unlock(&muxl->receive_lock);
         return up;
 }
@@ -203,8 +207,9 @@ static int cfmuxl_receive(struct cflayer *layr, struct cfpkt *pkt)
                  */
                 return /* CFGLU_EPROT; */ 0;
         }
-
+        cfsrvl_get(up);
         ret = up->receive(up, pkt);
+        cfsrvl_put(up);
         return ret;
 }