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atm: add owner of push() callback to atmvcc

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The atm is using atmvcc->push(vcc, NULL) callback to notify protocol
that vcc will be closed and protocol must detach from it. This callback
is usually used by protocol to decrement module usage count by module_put(),
but it leaves small window then module is still used after module_put().

Now the owner of push() callback is kept in atmvcc and
module_put(atmvcc->owner) is called after the protocol is detached from vcc.

Signed-off-by: Krzysztof Mazur <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
Acked-by: Chas Williams <[email protected]>
This commit is contained in:
Krzysztof Mazur 2012-11-06 23:16:57 +01:00 • committed by David Woodhouse
commit ec809bd817
2 changed files with 3 additions and 0 deletions
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2
net/atm/common.c
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@ -156,6 +156,7 @@ int vcc_create(struct net *net, struct socket *sock, int protocol, int family)
atomic_set(&sk->sk_rmem_alloc, 0);
vcc->push = NULL;
vcc->pop = NULL;
vcc->owner = NULL;
vcc->push_oam = NULL;
vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */
vcc->atm_options = vcc->aal_options = 0;
@ -175,6 +176,7 @@ static void vcc_destroy_socket(struct sock *sk)
vcc->dev->ops->close(vcc);
if (vcc->push)
vcc->push(vcc, NULL); /* atmarpd has no push */
module_put(vcc->owner);
while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
atm_return(vcc, skb->truesize);