[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20191026131910.3435-36-sashal@kernel.org>
Date: Sat, 26 Oct 2019 09:18:47 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Karsten Graul <kgraul@...ux.ibm.com>,
Ursula Braun <ubraun@...ux.ibm.com>,
Jakub Kicinski <jakub.kicinski@...ronome.com>,
Sasha Levin <sashal@...nel.org>, linux-s390@...r.kernel.org,
netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 36/59] net/smc: receive returns without data
From: Karsten Graul <kgraul@...ux.ibm.com>
[ Upstream commit 882dcfe5a1785c20f45820cbe6fec4b8b647c946 ]
smc_cdc_rxed_any_close_or_senddone() is used as an end condition for the
receive loop. This conflicts with smc_cdc_msg_recv_action() which could
run in parallel and set the bits checked by
smc_cdc_rxed_any_close_or_senddone() before the receive is processed.
In that case we could return from receive with no data, although data is
available. The same applies to smc_rx_wait().
Fix this by checking for RCV_SHUTDOWN only, which is set in
smc_cdc_msg_recv_action() after the receive was actually processed.
Fixes: 952310ccf2d8 ("smc: receive data from RMBE")
Reviewed-by: Ursula Braun <ubraun@...ux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@...ux.ibm.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
net/smc/smc_rx.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/net/smc/smc_rx.c b/net/smc/smc_rx.c
index bbcf0fe4ae10f..1ee5fdbf8284e 100644
--- a/net/smc/smc_rx.c
+++ b/net/smc/smc_rx.c
@@ -212,8 +212,7 @@ int smc_rx_wait(struct smc_sock *smc, long *timeo,
rc = sk_wait_event(sk, timeo,
sk->sk_err ||
sk->sk_shutdown & RCV_SHUTDOWN ||
- fcrit(conn) ||
- smc_cdc_rxed_any_close_or_senddone(conn),
+ fcrit(conn),
&wait);
remove_wait_queue(sk_sleep(sk), &wait);
sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
@@ -311,7 +310,6 @@ int smc_rx_recvmsg(struct smc_sock *smc, struct msghdr *msg,
smc_rx_update_cons(smc, 0);
if (sk->sk_shutdown & RCV_SHUTDOWN ||
- smc_cdc_rxed_any_close_or_senddone(conn) ||
conn->local_tx_ctrl.conn_state_flags.peer_conn_abort)
break;
--
2.20.1
Powered by blists - more mailing lists