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| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2016-03-06 01:39:55 +0000 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-03-05 22:13:42 -0500 |
| commit | eebeb74b0e838957a6ce376ef8426825aae03035 (patch) | |
| tree | a5064ea32f2ecc5482e5de30acf1ff718a6c2257 | |
| parent | 0f67c5beb42a8328e9e661dcfcc4d328b6138264 (diff) | |
| download | linux-stable-eebeb74b0e838957a6ce376ef8426825aae03035.tar.gz linux-stable-eebeb74b0e838957a6ce376ef8426825aae03035.tar.bz2 linux-stable-eebeb74b0e838957a6ce376ef8426825aae03035.zip | |
iscsi-target: Fix rx_login_comp hang after login failure
[ Upstream commit ca82c2bded29b38d36140bfa1e76a7bbfcade390 ]
This patch addresses a case where iscsi_target_do_tx_login_io()
fails sending the last login response PDU, after the RX/TX
threads have already been started.
The case centers around iscsi_target_rx_thread() not invoking
allow_signal(SIGINT) before the send_sig(SIGINT, ...) occurs
from the failure path, resulting in RX thread hanging
indefinately on iscsi_conn->rx_login_comp.
Note this bug is a regression introduced by:
commit e54198657b65625085834847ab6271087323ffea
Author: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Wed Jul 22 23:14:19 2015 -0700
iscsi-target: Fix iscsit_start_kthreads failure OOPs
To address this bug, complete ->rx_login_complete for good
measure in the failure path, and immediately return from
RX thread context if connection state did not actually reach
full feature phase (TARG_CONN_STATE_LOGGED_IN).
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: <stable@vger.kernel.org> # v3.10+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
| -rw-r--r-- | drivers/target/iscsi/iscsi_target.c | 13 | ||||
| -rw-r--r-- | drivers/target/iscsi/iscsi_target_nego.c | 1 |
2 files changed, 13 insertions, 1 deletions
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c index 958c732c428e..0b1fdfe34c98 100644 --- a/drivers/target/iscsi/iscsi_target.c +++ b/drivers/target/iscsi/iscsi_target.c @@ -4054,6 +4054,17 @@ reject: return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); } +static bool iscsi_target_check_conn_state(struct iscsi_conn *conn) +{ + bool ret; + + spin_lock_bh(&conn->state_lock); + ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); + spin_unlock_bh(&conn->state_lock); + + return ret; +} + int iscsi_target_rx_thread(void *arg) { int ret, rc; @@ -4071,7 +4082,7 @@ int iscsi_target_rx_thread(void *arg) * incoming iscsi/tcp socket I/O, and/or failing the connection. */ rc = wait_for_completion_interruptible(&conn->rx_login_comp); - if (rc < 0) + if (rc < 0 || iscsi_target_check_conn_state(conn)) return 0; if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) { diff --git a/drivers/target/iscsi/iscsi_target_nego.c b/drivers/target/iscsi/iscsi_target_nego.c index 092112e5e1a6..dcb63481325f 100644 --- a/drivers/target/iscsi/iscsi_target_nego.c +++ b/drivers/target/iscsi/iscsi_target_nego.c @@ -393,6 +393,7 @@ err: if (login->login_complete) { if (conn->rx_thread && conn->rx_thread_active) { send_sig(SIGINT, conn->rx_thread, 1); + complete(&conn->rx_login_comp); kthread_stop(conn->rx_thread); } if (conn->tx_thread && conn->tx_thread_active) { |