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>

diff --git a/include/linux/atmdev.h b/include/linux/atmdev.h
index 72db2af..c1da539 100644 (file)
--- a/include/linux/atmdev.h
+++ b/include/linux/atmdev.h
@@ -99,6 +99,7 @@ struct atm_vcc {
        struct atm_dev  *dev;           /* device back pointer */
        struct atm_qos  qos;            /* QOS */
        struct atm_sap  sap;            /* SAP */
+       void (*release_cb)(struct atm_vcc *vcc); /* release_sock callback */
        void (*push)(struct atm_vcc *vcc,struct sk_buff *skb);
        void (*pop)(struct atm_vcc *vcc,struct sk_buff *skb); /* optional */
        int (*push_oam)(struct atm_vcc *vcc,void *cell);

diff --git a/net/atm/common.c b/net/atm/common.c
index 2421664..806fc0a 100644 (file)
--- 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;