[PATCH v2 1/8] scsi: target: Modify core_tmr_abort_task()

[Bodo Stroesser <bstroesser@ts.fujitsu.com>]

This patch modifies core_tmr_abort_task() to use same looping
and locking scheme as core_tmr_drain_state_list() does.

This frees the state_list element in se_cmd for later use
by tmr notification handling.

Note: __target_check_io_state() now is called with param 0
instead of dev->dev_attrib.emulate_tas, because tas is not
relevant since we always get ABRT on same session like the
aborted command.

Signed-off-by: Bodo Stroesser <bstroesser@ts.fujitsu.com>
---
 drivers/target/target_core_tmr.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c
index 89c84d472cd7..b65d7a0a5df1 100644
--- a/drivers/target/target_core_tmr.c
+++ b/drivers/target/target_core_tmr.c
@@ -116,14 +116,15 @@ void core_tmr_abort_task(
 	struct se_tmr_req *tmr,
 	struct se_session *se_sess)
 {
-	struct se_cmd *se_cmd;
+	struct se_cmd *se_cmd, *next;
 	unsigned long flags;
+	bool rc;
 	u64 ref_tag;
 
-	spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
-	list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) {
+	spin_lock_irqsave(&dev->execute_task_lock, flags);
+	list_for_each_entry_safe(se_cmd, next, &dev->state_list, state_list) {
 
-		if (dev != se_cmd->se_dev)
+		if (se_sess != se_cmd->se_sess)
 			continue;
 
 		/* skip task management functions, including tmr->task_cmd */
@@ -137,11 +138,16 @@ void core_tmr_abort_task(
 		printk("ABORT_TASK: Found referenced %s task_tag: %llu\n",
 			se_cmd->se_tfo->fabric_name, ref_tag);
 
-		if (!__target_check_io_state(se_cmd, se_sess,
-					     dev->dev_attrib.emulate_tas))
+		spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
+		rc = __target_check_io_state(se_cmd, se_sess, 0);
+		spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
+		if (!rc)
 			continue;
 
-		spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
+		list_del_init(&se_cmd->state_list);
+		se_cmd->state_active = false;
+
+		spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 
 		/*
 		 * Ensure that this ABORT request is visible to the LU RESET
@@ -159,7 +165,7 @@ void core_tmr_abort_task(
 		atomic_long_inc(&dev->aborts_complete);
 		return;
 	}
-	spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
+	spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 
 	printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %lld\n",
 			tmr->ref_task_tag);
-- 
2.12.3