atm: add release_cb() callback to vcc

The immediate use case for this is that it will allow us to ensure that a
pppoatm queue is woken after it has to drop a packet due to the sock being
locked.

Note that 'release_cb' is called when the socket is *unlocked*. This is
not to be confused with vcc_release() — which probably ought to be called
vcc_close().

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Acked-by: Krzysztof Mazur <krzysiek@podlesie.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/net/atm/common.c b/net/atm/common.c
index 24216642d696..806fc0a40051 100644
--- a/net/atm/common.c
+++ b/net/atm/common.c
@@ -126,10 +126,19 @@ static void vcc_write_space(struct sock *sk)
         rcu_read_unlock();
 }
 
+static void vcc_release_cb(struct sock *sk)
+{
+        struct atm_vcc *vcc = atm_sk(sk);
+
+        if (vcc->release_cb)
+                vcc->release_cb(vcc);
+}
+
 static struct proto vcc_proto = {
         .name     = "VCC",
         .owner    = THIS_MODULE,
         .obj_size = sizeof(struct atm_vcc),
+        .release_cb = vcc_release_cb,
 };
 
 int vcc_create(struct net *net, struct socket *sock, int protocol, int family)
@@ -158,6 +167,7 @@ int vcc_create(struct net *net, struct socket *sock, int protocol, int family)
         vcc->pop = NULL;
         vcc->owner = NULL;
         vcc->push_oam = NULL;
+        vcc->release_cb = NULL;
         vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */
         vcc->atm_options = vcc->aal_options = 0;
         sk->sk_destruct = vcc_sock_destruct;