net: add net device refcount tracker to struct packet_type
Most notable changes are in af_packet, tipc ones are trivial.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jon Maloy <jmaloy@redhat.com>
Cc: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index c06e9dc..a419718 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2533,6 +2533,7 @@ struct packet_type {
__be16 type; /* This is really htons(ether_type). */
bool ignore_outgoing;
struct net_device *dev; /* NULL is wildcarded here */
+ netdevice_tracker dev_tracker;
int (*func) (struct sk_buff *,
struct net_device *,
struct packet_type *,
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index a1ffdb4..71854a16 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -3109,7 +3109,7 @@ static int packet_release(struct socket *sock)
packet_cached_dev_reset(po);
if (po->prot_hook.dev) {
- dev_put(po->prot_hook.dev);
+ dev_put_track(po->prot_hook.dev, &po->prot_hook.dev_tracker);
po->prot_hook.dev = NULL;
}
spin_unlock(&po->bind_lock);
@@ -3217,18 +3217,25 @@ static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
WRITE_ONCE(po->num, proto);
po->prot_hook.type = proto;
+ dev_put_track(dev_curr, &po->prot_hook.dev_tracker);
+ dev_curr = NULL;
+
if (unlikely(unlisted)) {
dev_put(dev);
po->prot_hook.dev = NULL;
WRITE_ONCE(po->ifindex, -1);
packet_cached_dev_reset(po);
} else {
+ if (dev)
+ netdev_tracker_alloc(dev,
+ &po->prot_hook.dev_tracker,
+ GFP_ATOMIC);
po->prot_hook.dev = dev;
WRITE_ONCE(po->ifindex, dev ? dev->ifindex : 0);
packet_cached_dev_assign(po, dev);
}
}
- dev_put(dev_curr);
+ dev_put_track(dev_curr, &po->prot_hook.dev_tracker);
if (proto == 0 || !need_rehook)
goto out_unlock;
@@ -4138,7 +4145,8 @@ static int packet_notifier(struct notifier_block *this,
if (msg == NETDEV_UNREGISTER) {
packet_cached_dev_reset(po);
WRITE_ONCE(po->ifindex, -1);
- dev_put(po->prot_hook.dev);
+ dev_put_track(po->prot_hook.dev,
+ &po->prot_hook.dev_tracker);
po->prot_hook.dev = NULL;
}
spin_unlock(&po->bind_lock);
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 60bc74b..473a790 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -787,7 +787,7 @@ int tipc_attach_loopback(struct net *net)
if (!dev)
return -ENODEV;
- dev_hold(dev);
+ dev_hold_track(dev, &tn->loopback_pt.dev_tracker, GFP_KERNEL);
tn->loopback_pt.dev = dev;
tn->loopback_pt.type = htons(ETH_P_TIPC);
tn->loopback_pt.func = tipc_loopback_rcv_pkt;
@@ -800,7 +800,7 @@ void tipc_detach_loopback(struct net *net)
struct tipc_net *tn = tipc_net(net);
dev_remove_pack(&tn->loopback_pt);
- dev_put(net->loopback_dev);
+ dev_put_track(net->loopback_dev, &tn->loopback_pt.dev_tracker);
}
/* Caller should hold rtnl_lock to protect the bearer */