Commit 481c3420 authored by Nicholas Bellinger's avatar Nicholas Bellinger Committed by Greg Kroah-Hartman

iscsi-target: Fix rx_login_comp hang after login failure

commit ca82c2bd upstream.

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 e5419865
  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>
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f7d615b9
......@@ -3960,6 +3960,17 @@ static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
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;
......@@ -3977,7 +3988,7 @@ 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) {
......
......@@ -384,6 +384,7 @@ static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_log
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) {
......
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