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llc: add net device refcount tracker 

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2021-12-06 17:30:34 -08:00 committed by Jakub Kicinski
parent 66ce07f780
commit 615d069dcf
2 changed files with 4 additions and 2 deletions
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1
include/net/llc_conn.h
View File

@ -38,6 +38,7 @@ struct llc_sock {
struct llc_addr laddr; /* lsap/mac pair */
struct llc_addr daddr; /* dsap/mac pair */
struct net_device *dev; /* device to send to remote */
netdevice_tracker dev_tracker;
u32 copied_seq; /* head of yet unread data */
u8 retry_count; /* number of retries */
u8 ack_must_be_send;

5
net/llc/af_llc.c
View File

@ -224,7 +224,7 @@ static int llc_ui_release(struct socket *sock)
} else {
release_sock(sk);
}
dev_put(llc->dev);
dev_put_track(llc->dev, &llc->dev_tracker);
sock_put(sk);
llc_sk_free(sk);
out:
@ -295,6 +295,7 @@ static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
if (!llc->dev)
goto out;
netdev_tracker_alloc(llc->dev, &llc->dev_tracker, GFP_KERNEL);
rc = -EUSERS;
llc->laddr.lsap = llc_ui_autoport();
if (!llc->laddr.lsap)
@ -362,7 +363,7 @@ static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
} else
llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd,
addr->sllc_mac);
dev_hold(llc->dev);
dev_hold_track(llc->dev, &llc->dev_tracker, GFP_ATOMIC);
rcu_read_unlock();
if (!llc->dev)
goto out;