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| author | Krzysztof Mazur <krzysiek@podlesie.net> | 2012-11-06 23:16:57 +0100 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2012-11-28 00:36:48 +0000 |
| commit | ec809bd817dfa1905283468e4c813684ed4efe78 (patch) | |
| tree | 6e13787ae7a88c73316e91f02b8116cc93309752 | |
| parent | ae088d663beebb3cad0e7abaac67ee61a7c578d5 (diff) | |
| download | linux-stable-ec809bd817dfa1905283468e4c813684ed4efe78.tar.gz linux-stable-ec809bd817dfa1905283468e4c813684ed4efe78.tar.bz2 linux-stable-ec809bd817dfa1905283468e4c813684ed4efe78.zip | |
atm: add owner of push() callback to atmvcc
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 <krzysiek@podlesie.net>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Acked-by: Chas Williams <chas@cmf.nrl.navy.mil>
| -rw-r--r-- | include/linux/atmdev.h | 1 | ||||
| -rw-r--r-- | net/atm/common.c | 2 |
2 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/atmdev.h b/include/linux/atmdev.h index 22ef21c33d0c..72db2af902a8 100644 --- a/include/linux/atmdev.h +++ b/include/linux/atmdev.h @@ -106,6 +106,7 @@ struct atm_vcc { void *dev_data; /* per-device data */ void *proto_data; /* per-protocol data */ struct k_atm_aal_stats *stats; /* pointer to AAL stats group */ + struct module *owner; /* owner of ->push function */ /* SVC part --- may move later ------------------------------------- */ short itf; /* interface number */ struct sockaddr_atmsvc local; diff --git a/net/atm/common.c b/net/atm/common.c index 0c0ad930a632..24216642d696 100644 --- a/net/atm/common.c +++ b/net/atm/common.c @@ -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); |