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caif: Bugfix debugfs directory name must be unique. 

Race condition caused debugfs_create_dir() to fail due to duplicate
name. Use atomic counter to create unique directory name.

net_ratelimit() is introduced to limit debug printouts.

Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
sjur.brandeland@stericsson.com 2011-05-13 02:44:07 +00:00 committed by David S. Miller
parent c85c2951d4
commit 33b2f5598b
1 changed files with 22 additions and 12 deletions
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34
net/caif/caif_socket.c
View File

@ -48,6 +48,7 @@ static struct dentry *debugfsdir;
#ifdef CONFIG_DEBUG_FS
struct debug_fs_counter {
atomic_t caif_nr_socks;
atomic_t caif_sock_create;
atomic_t num_connect_req;
atomic_t num_connect_resp;
atomic_t num_connect_fail_resp;
@ -59,11 +60,11 @@ struct debug_fs_counter {
atomic_t num_rx_flow_on;
};
static struct debug_fs_counter cnt;
#define dbfs_atomic_inc(v) atomic_inc(v)
#define dbfs_atomic_dec(v) atomic_dec(v)
#define dbfs_atomic_inc(v) atomic_inc_return(v)
#define dbfs_atomic_dec(v) atomic_dec_return(v)
#else
#define dbfs_atomic_inc(v)
#define dbfs_atomic_dec(v)
#define dbfs_atomic_inc(v) 0
#define dbfs_atomic_dec(v) 0
#endif
struct caifsock {
@ -155,9 +156,10 @@ static int caif_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
(unsigned)sk->sk_rcvbuf && rx_flow_is_on(cf_sk)) {
pr_debug("sending flow OFF (queue len = %d %d)\n",
atomic_read(&cf_sk->sk.sk_rmem_alloc),
sk_rcvbuf_lowwater(cf_sk));
if (net_ratelimit())
pr_debug("sending flow OFF (queue len = %d %d)\n",
atomic_read(&cf_sk->sk.sk_rmem_alloc),
sk_rcvbuf_lowwater(cf_sk));
set_rx_flow_off(cf_sk);
dbfs_atomic_inc(&cnt.num_rx_flow_off);
caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ);
@ -168,7 +170,8 @@ static int caif_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
return err;
if (!sk_rmem_schedule(sk, skb->truesize) && rx_flow_is_on(cf_sk)) {
set_rx_flow_off(cf_sk);
pr_debug("sending flow OFF due to rmem_schedule\n");
if (net_ratelimit())
pr_debug("sending flow OFF due to rmem_schedule\n");
dbfs_atomic_inc(&cnt.num_rx_flow_off);
caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ);
}
@ -838,7 +841,7 @@ static int caif_connect(struct socket *sock, struct sockaddr *uaddr,
sock->state = SS_CONNECTING;
sk->sk_state = CAIF_CONNECTING;
/* Check priority value coming from socket */
/* Check priority value comming from socket */
/* if priority value is out of range it will be ajusted */
if (cf_sk->sk.sk_priority > CAIF_PRIO_MAX)
cf_sk->conn_req.priority = CAIF_PRIO_MAX;
@ -942,6 +945,7 @@ static int caif_release(struct socket *sock)
dbfs_atomic_inc(&cnt.num_disconnect);
WARN_ON(IS_ERR(cf_sk->debugfs_socket_dir));
if (cf_sk->debugfs_socket_dir != NULL)
debugfs_remove_recursive(cf_sk->debugfs_socket_dir);
@ -1047,7 +1051,7 @@ static void caif_sock_destructor(struct sock *sk)
caif_assert(sk_unhashed(sk));
caif_assert(!sk->sk_socket);
if (!sock_flag(sk, SOCK_DEAD)) {
pr_info("Attempt to release alive CAIF socket: %p\n", sk);
pr_debug("Attempt to release alive CAIF socket: %p\n", sk);
return;
}
sk_stream_kill_queues(&cf_sk->sk);
@ -1058,6 +1062,7 @@ static void caif_sock_destructor(struct sock *sk)
static int caif_create(struct net *net, struct socket *sock, int protocol,
int kern)
{
int num;
struct sock *sk = NULL;
struct caifsock *cf_sk = NULL;
static struct proto prot = {.name = "PF_CAIF",
@ -1120,14 +1125,16 @@ static int caif_create(struct net *net, struct socket *sock, int protocol,
cf_sk->conn_req.protocol = protocol;
/* Increase the number of sockets created. */
dbfs_atomic_inc(&cnt.caif_nr_socks);
num = dbfs_atomic_inc(&cnt.caif_sock_create);
#ifdef CONFIG_DEBUG_FS
if (!IS_ERR(debugfsdir)) {
/* Fill in some information concerning the misc socket. */
snprintf(cf_sk->name, sizeof(cf_sk->name), "cfsk%d",
atomic_read(&cnt.caif_nr_socks));
snprintf(cf_sk->name, sizeof(cf_sk->name), "cfsk%d", num);
cf_sk->debugfs_socket_dir =
debugfs_create_dir(cf_sk->name, debugfsdir);
debugfs_create_u32("sk_state", S_IRUSR | S_IWUSR,
cf_sk->debugfs_socket_dir,
(u32 *) &cf_sk->sk.sk_state);
@ -1171,6 +1178,9 @@ static int __init caif_sktinit_module(void)
debugfs_create_u32("num_sockets", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.caif_nr_socks);
debugfs_create_u32("num_create", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.caif_sock_create);
debugfs_create_u32("num_connect_req", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.num_connect_req);