[Devel] [PATCH 20/23] target: Fix target_release_cmd_kref shutdown comp leak

[Andrei Vagin]

From: Himanshu Madhani <himanshu.madhani at qlogic.com>

ML: 5e47f1985d7107331c3f64fb3ec83d66fd73577e

This patch fixes an active I/O shutdown bug for fabric
drivers using target_wait_for_sess_cmds(), where se_cmd
descriptor shutdown would result in hung tasks waiting
indefinitely for se_cmd->cmd_wait_comp to complete().

To address this bug, drop the incorrect list_del_init()
usage in target_wait_for_sess_cmds() and always complete()
during se_cmd target_release_cmd_kref() put, in order to
let caller invoke the final fabric release callback
into se_cmd->se_tfo->release_cmd() code.

Reported-by: Himanshu Madhani <himanshu.madhani at qlogic.com>
Tested-by: Himanshu Madhani <himanshu.madhani at qlogic.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani at qlogic.com>
Cc: stable at vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab at linux-iscsi.org>
Signed-off-by: Andrei Vagin <avagin at openvz.org>
---
 drivers/target/target_core_transport.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 96900a8..d7e0fe1 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2617,8 +2617,6 @@ void target_wait_for_sess_cmds(struct se_session *se_sess)
 
 	list_for_each_entry_safe(se_cmd, tmp_cmd,
 				&se_sess->sess_wait_list, se_cmd_list) {
-		list_del_init(&se_cmd->se_cmd_list);
-
 		pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
 			" %d\n", se_cmd, se_cmd->t_state,
 			se_cmd->se_tfo->get_cmd_state(se_cmd));
-- 
1.8.3.1