diff options
Diffstat (limited to 'drivers/infiniband/sw/siw')
| -rw-r--r-- | drivers/infiniband/sw/siw/siw_cm.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/infiniband/sw/siw/siw_cm.c b/drivers/infiniband/sw/siw/siw_cm.c index eb0bd4f79a85..1d3de8209bfa 100644 --- a/drivers/infiniband/sw/siw/siw_cm.c +++ b/drivers/infiniband/sw/siw/siw_cm.c @@ -39,6 +39,55 @@ static void siw_cm_llp_error_report(struct sock *s); static int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason, int status); + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +/* + * lockdep can detect false positive circular dependencies + * when there are user-space socket API users or in kernel + * users switching between a tcp and rdma transport. + * Maybe also switching between siw and rxe may cause + * problems as per default sockets are only classified + * by family and not by ip protocol. And there might + * be different locks used between the application + * and the low level sockets. + * + * Problems were seen with ksmbd.ko and cifs.ko, + * switching transports, use git blame to find + * more details. + */ +static struct lock_class_key siw_sk_key[2]; +static struct lock_class_key siw_slock_key[2]; +#endif /* CONFIG_DEBUG_LOCK_ALLOC */ + +static inline void siw_reclassify_socket(struct socket *sock) +{ +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct sock *sk = sock->sk; + + if (WARN_ON_ONCE(!sock_allow_reclassification(sk))) + return; + + switch (sk->sk_family) { + case AF_INET: + sock_lock_init_class_and_name(sk, + "slock-AF_INET-RDMA-SIW", + &siw_slock_key[0], + "sk_lock-AF_INET-RDMA-SIW", + &siw_sk_key[0]); + break; + case AF_INET6: + sock_lock_init_class_and_name(sk, + "slock-AF_INET6-RDMA-SIW", + &siw_slock_key[1], + "sk_lock-AF_INET6-RDMA-SIW", + &siw_sk_key[1]); + break; + default: + WARN_ON_ONCE(1); + } +#endif /* CONFIG_DEBUG_LOCK_ALLOC */ +} + static void siw_sk_assign_cm_upcalls(struct sock *sk) { struct siw_cep *cep = sk_to_cep(sk); @@ -1394,6 +1443,7 @@ int siw_connect(struct iw_cm_id *id, struct iw_cm_conn_param *params) rv = sock_create(v4 ? AF_INET : AF_INET6, SOCK_STREAM, IPPROTO_TCP, &s); if (rv < 0) goto error; + siw_reclassify_socket(s); /* * NOTE: For simplification, connect() is called in blocking @@ -1770,6 +1820,7 @@ int siw_create_listen(struct iw_cm_id *id, int backlog) rv = sock_create(addr_family, SOCK_STREAM, IPPROTO_TCP, &s); if (rv < 0) return rv; + siw_reclassify_socket(s); /* * Allow binding local port when still in TIME_WAIT from last close. |