[RHEL7,COMMIT] ms/target: Fix target_release_cmd_kref shutdown comp leak

Submitted by Konstantin Khorenko on April 2, 2018, 2:28 p.m.


Message ID 201804021428.w32ESTqv024630@finist_ce7.work
State New
Series "target: backport bug fixes from the upstream kernel"
Headers show

Commit Message

Konstantin Khorenko April 2, 2018, 2:28 p.m.
The commit is pushed to "branch-rh7-3.10.0-693.21.1.vz7.46.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-693.21.1.vz7.46.2
commit 60377be1b944ab89acaa627e4a19327c810151f9
Author: Himanshu Madhani <himanshu.madhani@qlogic.com>
Date:   Mon Apr 2 17:28:29 2018 +0300

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

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diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index dc10e162ef93..9b187cf1c5b0 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2607,8 +2607,6 @@  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,