From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ying Xue Subject: [PATCH net-next 1/5] tipc: standardize connect routine Date: Fri, 17 Jan 2014 09:50:03 +0800 Message-ID: <1389923407-26969-2-git-send-email-ying.xue@windriver.com> References: <1389923407-26969-1-git-send-email-ying.xue@windriver.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: jon.maloy@ericsson.com, netdev@vger.kernel.org, Paul.Gortmaker@windriver.com, tipc-discussion@lists.sourceforge.net To: Return-path: In-Reply-To: <1389923407-26969-1-git-send-email-ying.xue@windriver.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: tipc-discussion-bounces@lists.sourceforge.net List-Id: netdev.vger.kernel.org Comparing the behaviour of how to wait for events in TIPC connect() with other stacks, the TIPC implementation might be perceived as different, and sometimes even incorrect. For instance, as both sock->state and sk_sleep() are directly fed to wait_event_interruptible_timeout() as its arguments, and socket lock has to be released before we call wait_event_interruptible_timeout(), the two variables associated with socket are exposed out of socket lock protection, thereby probably getting stale values so that the process of calling connect() cannot be woken up exactly even if correct event arrives or it is woken up improperly even if the wake condition is not satisfied in practice. Therefore, standardizing its behaviour with sk_stream_wait_connect routine can avoid these risks. Additionally the implementation of connect routine is simplified as a whole, allowing it to return correct values in all different cases. Signed-off-by: Ying Xue Reviewed-by: Jon Maloy --- net/tipc/socket.c | 63 ++++++++++++++++++++++++++++------------------------- 1 file changed, 33 insertions(+), 30 deletions(-) diff --git a/net/tipc/socket.c b/net/tipc/socket.c index c8341d1..b2ae25a 100644 --- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -1438,6 +1438,28 @@ static void wakeupdispatch(struct tipc_port *tport) sk->sk_write_space(sk); } +static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) +{ + struct sock *sk = sock->sk; + DEFINE_WAIT(wait); + int done; + + do { + int err = sock_error(sk); + if (err) + return err; + if (!*timeo_p) + return -ETIMEDOUT; + if (signal_pending(current)) + return sock_intr_errno(*timeo_p); + + prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); + done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING); + finish_wait(sk_sleep(sk), &wait); + } while (!done); + return 0; +} + /** * connect - establish a connection to another TIPC port * @sock: socket structure @@ -1453,7 +1475,8 @@ static int connect(struct socket *sock, struct sockaddr *dest, int destlen, struct sock *sk = sock->sk; struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; struct msghdr m = {NULL,}; - unsigned int timeout; + long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout; + socket_state previous; int res; lock_sock(sk); @@ -1475,8 +1498,7 @@ static int connect(struct socket *sock, struct sockaddr *dest, int destlen, goto exit; } - timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout; - + previous = sock->state; switch (sock->state) { case SS_UNCONNECTED: /* Send a 'SYN-' to destination */ @@ -1498,41 +1520,22 @@ static int connect(struct socket *sock, struct sockaddr *dest, int destlen, * case is EINPROGRESS, rather than EALREADY. */ res = -EINPROGRESS; - break; case SS_CONNECTING: - res = -EALREADY; + if (previous == SS_CONNECTING) + res = -EALREADY; + if (!timeout) + goto exit; + timeout = msecs_to_jiffies(timeout); + /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ + res = tipc_wait_for_connect(sock, &timeout); break; case SS_CONNECTED: res = -EISCONN; break; default: res = -EINVAL; - goto exit; - } - - if (sock->state == SS_CONNECTING) { - if (!timeout) - goto exit; - - /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ - release_sock(sk); - res = wait_event_interruptible_timeout(*sk_sleep(sk), - sock->state != SS_CONNECTING, - timeout ? (long)msecs_to_jiffies(timeout) - : MAX_SCHEDULE_TIMEOUT); - if (res <= 0) { - if (res == 0) - res = -ETIMEDOUT; - return res; - } - lock_sock(sk); + break; } - - if (unlikely(sock->state == SS_DISCONNECTING)) - res = sock_error(sk); - else - res = 0; - exit: release_sock(sk); return res; -- 1.7.9.5 ------------------------------------------------------------------------------ CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk