linux-kernel - [PATCH 3.12 152/181] target: Set CMD_T_ACTIVE bit for Task Management Requests

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Message-Id: <4993301605b1aa1d09be6567a709ff3bca966caa.1404128998.git.jslaby@suse.cz>
Date:	Mon, 30 Jun 2014 13:52:53 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Nicholas Bellinger <nab@...ux-iscsi.org>,
	Thomas Glanzmann <thomas@...nzmann.de>,
	Charalampos Pournaris <charpour@...il.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 152/181] target: Set CMD_T_ACTIVE bit for Task Management Requests

From: Nicholas Bellinger <nab@...ux-iscsi.org>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit f15e9cd910c4d9da7de43f2181f362082fc45f0f upstream.

This patch fixes a bug where se_cmd descriptors associated with a
Task Management Request (TMR) where not setting CMD_T_ACTIVE before
being dispatched into target_tmr_work() process context.

This is required in order for transport_generic_free_cmd() ->
transport_wait_for_tasks() to wait on se_cmd->t_transport_stop_comp
if a session reset event occurs while an ABORT_TASK is outstanding
waiting for another I/O to complete.

Cc: Thomas Glanzmann <thomas@...nzmann.de>
Cc: Charalampos Pournaris <charpour@...il.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/target/target_core_transport.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index edacb8d0d6b8..7756d069dcee 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -3001,6 +3001,12 @@ static void target_tmr_work(struct work_struct *work)
 int transport_generic_handle_tmr(
 	struct se_cmd *cmd)
 {
+	unsigned long flags;
+
+	spin_lock_irqsave(&cmd->t_state_lock, flags);
+	cmd->transport_state |= CMD_T_ACTIVE;
+	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+
 	INIT_WORK(&cmd->work, target_tmr_work);
 	queue_work(cmd->se_dev->tmr_wq, &cmd->work);
 	return 0;
-- 
2.0.0

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