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NFC: Purge LLCP socket Tx queues when being disconnected 

The Tx queues are no longer valid when we receive a disconnection or when
the LLCP link goes down. In the later case we also purge the entire local
Tx queue.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Samuel Ortiz 2012-10-26 18:20:10 +02:00
parent f152218840
commit f31652a58b
1 changed files with 31 additions and 0 deletions
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31
net/nfc/llcp/llcp.c
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@ -45,12 +45,38 @@ void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
write_unlock(&l->lock); write_unlock(&l->lock);
} }
static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
{
struct nfc_llcp_local *local = sock->local;
struct sk_buff *s, *tmp;
pr_debug("%p\n", &sock->sk);
skb_queue_purge(&sock->tx_queue);
skb_queue_purge(&sock->tx_pending_queue);
skb_queue_purge(&sock->tx_backlog_queue);
if (local == NULL)
return;
/* Search for local pending SKBs that are related to this socket */
skb_queue_walk_safe(&local->tx_queue, s, tmp) {
if (s->sk != &sock->sk)
continue;
skb_unlink(s, &local->tx_queue);
kfree_skb(s);
}
}
static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen) static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen)
{ {
struct sock *sk; struct sock *sk;
struct hlist_node *node, *tmp; struct hlist_node *node, *tmp;
struct nfc_llcp_sock *llcp_sock; struct nfc_llcp_sock *llcp_sock;
skb_queue_purge(&local->tx_queue);
write_lock(&local->sockets.lock); write_lock(&local->sockets.lock);
sk_for_each_safe(sk, node, tmp, &local->sockets.head) { sk_for_each_safe(sk, node, tmp, &local->sockets.head) {
@ -58,6 +84,8 @@ static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen)
bh_lock_sock(sk); bh_lock_sock(sk);
nfc_llcp_socket_purge(llcp_sock);
if (sk->sk_state == LLCP_CONNECTED) if (sk->sk_state == LLCP_CONNECTED)
nfc_put_device(llcp_sock->dev); nfc_put_device(llcp_sock->dev);
@ -1002,6 +1030,9 @@ static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
sk = &llcp_sock->sk; sk = &llcp_sock->sk;
lock_sock(sk); lock_sock(sk);
nfc_llcp_socket_purge(llcp_sock);
if (sk->sk_state == LLCP_CLOSED) { if (sk->sk_state == LLCP_CLOSED) {
release_sock(sk); release_sock(sk);
nfc_llcp_sock_put(llcp_sock); nfc_llcp_sock_put(llcp_sock);