linux-kernel - [PATCH 043/241] target: Fix incorrect usage of nested IRQ spinlocks in ABORT

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Message-Id: <1355407206-17100-44-git-send-email-herton.krzesinski@canonical.com>
Date:	Thu, 13 Dec 2012 11:56:48 -0200
From:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Steve Hodgson <steve@...estorage.com>,
	Roland Dreier <roland@...estorage.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>,
	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Subject: [PATCH 043/241] target: Fix incorrect usage of nested IRQ spinlocks in ABORT_TASK path

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

------------------

From: Steve Hodgson <steve@...estorage.com>

commit ab74b3d62f05192bf8fb8f169e7999d1183b2e08 upstream.

This patch changes core_tmr_abort_task() to use spin_lock -> spin_unlock
around se_cmd->t_state_lock while spin_lock_irqsave is held via
se_sess->sess_cmd_lock.

Signed-off-by: Steve Hodgson <steve@...estorage.com>
Signed-off-by: Roland Dreier <roland@...estorage.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
---
 drivers/target/target_core_tmr.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c
index 84caf1b..eac70676 100644
--- a/drivers/target/target_core_tmr.c
+++ b/drivers/target/target_core_tmr.c
@@ -140,15 +140,15 @@ void core_tmr_abort_task(
 		printk("ABORT_TASK: Found referenced %s task_tag: %u\n",
 			se_cmd->se_tfo->get_fabric_name(), ref_tag);
 
-		spin_lock_irq(&se_cmd->t_state_lock);
+		spin_lock(&se_cmd->t_state_lock);
 		if (se_cmd->transport_state & CMD_T_COMPLETE) {
 			printk("ABORT_TASK: ref_tag: %u already complete, skipping\n", ref_tag);
-			spin_unlock_irq(&se_cmd->t_state_lock);
+			spin_unlock(&se_cmd->t_state_lock);
 			spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
 			goto out;
 		}
 		se_cmd->transport_state |= CMD_T_ABORTED;
-		spin_unlock_irq(&se_cmd->t_state_lock);
+		spin_unlock(&se_cmd->t_state_lock);
 
 		list_del_init(&se_cmd->se_cmd_list);
 		kref_get(&se_cmd->cmd_kref);
-- 
1.7.9.5

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