On Sun, 2012-11-11 at 12:04 +0100, Krzysztof Mazur wrote: > Yes, but socket can be also locked for a long time, vcc_sendmsg() sleeps > owning socket lock waiting for memory or atm_may_send().
Right. Something like this then, instead of my previous patch 8/7?
Only addresses the sock_owned_by_user() case and not ATM_VF_RELEASED,
ATM_VF_CLOSE or !ATM_VF_READY, but your amended patch 6 fixes that I
think.
diff --git a/include/linux/atmdev.h b/include/linux/atmdev.h
index 31c16c6..59532ed 100644
--- a/include/linux/atmdev.h
+++ b/include/linux/atmdev.h
@@ -308,6 +308,7 @@ struct atm_vcc {
struct atm_dev *dev; /* device back pointer */
struct atm_qos qos; /* QOS */
struct atm_sap sap; /* SAP */
+ void (*unlock_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 ea952b2..c212016 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_unlock_cb(struct sock *sk)
+{
+ struct atm_vcc *vcc = atm_sk(sk);
+
+ if (vcc->unlock_cb)
+ vcc->unlock_cb(vcc);
+}
+
static struct proto vcc_proto = {
.name = "VCC",
.owner = THIS_MODULE,
.obj_size = sizeof(struct atm_vcc),
+ .release_cb = vcc_unlock_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->unlock_cb = NULL;
vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */
vcc->atm_options = vcc->aal_options = 0;
sk->sk_destruct = vcc_sock_destruct;
diff --git a/net/atm/pppoatm.c b/net/atm/pppoatm.c
index 7507c20..751569a 100644
--- a/net/atm/pppoatm.c
+++ b/net/atm/pppoatm.c
@@ -60,6 +60,7 @@ struct pppoatm_vcc {
struct atm_vcc *atmvcc; /* VCC descriptor */
void (*old_push)(struct atm_vcc *, struct sk_buff *);
void (*old_pop)(struct atm_vcc *, struct sk_buff *);
+ void (*old_unlock_cb)(struct atm_vcc *);
struct module *old_owner;
/* keep old push/pop for detaching */
enum pppoatm_encaps encaps;
@@ -108,6 +109,14 @@ static void pppoatm_wakeup_sender(unsigned long arg)
ppp_output_wakeup((struct ppp_channel *) arg);
}
+static void pppoatm_unlock_cb(struct atm_vcc *atmvcc)
+{
+ struct pppoatm_vcc *pvcc = atmvcc_to_pvcc(atmvcc);
+
+ tasklet_schedule(&pvcc->wakeup_tasklet);
+ if (pvcc->old_unlock_cb)
+ pvcc->old_unlock_cb(atmvcc);
+}
/*
* This gets called every time the ATM card has finished sending our
* skb. The ->old_pop will take care up normal atm flow control,
@@ -152,6 +161,7 @@ static void pppoatm_unassign_vcc(struct atm_vcc *atmvcc)
pvcc = atmvcc_to_pvcc(atmvcc);
atmvcc->push = pvcc->old_push;
atmvcc->pop = pvcc->old_pop;
+ atmvcc->unlock_cb = pvcc->old_unlock_cb;
tasklet_kill(&pvcc->wakeup_tasklet);
ppp_unregister_channel(&pvcc->chan);
atmvcc->user_back = NULL;
@@ -385,6 +395,7 @@ static int pppoatm_assign_vcc(struct atm_vcc *atmvcc, void
__user *arg)
pvcc->old_push = atmvcc->push;
pvcc->old_pop = atmvcc->pop;
pvcc->old_owner = atmvcc->owner;
+ pvcc->old_unlock_cb = atmvcc->unlock_cb;
pvcc->encaps = (enum pppoatm_encaps) be.encaps;
pvcc->chan.private = pvcc;
pvcc->chan.ops = &pppoatm_ops;
--
dwmw2
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