[040/264] target: Prevent transport_send_task_abort when CHECK_CONDITION status

[Greg KH]

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

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

From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>

commit c252f003470a99d319db4ebd12f4a9e4710a65db upstream.

This patch fixes a bug where transport_send_task_abort() could be called
during LUN_RESET to return SAM_STAT_TASK_ABORTED + tfo->queue_status(), when
SCF_SENT_CHECK_CONDITION -> tfo->queue_status() has already been sent from
within another context via transport_send_check_condition_and_sense().

Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/target/target_core_transport.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -4920,6 +4920,15 @@ EXPORT_SYMBOL(transport_check_aborted_st
 
 void transport_send_task_abort(struct se_cmd *cmd)
 {
+	unsigned long flags;
+
+	spin_lock_irqsave(&cmd->t_state_lock, flags);
+	if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
+		spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+		return;
+	}
+	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+
 	/*
 	 * If there are still expected incoming fabric WRITEs, we wait
 	 * until until they have completed before sending a TASK_ABORTED


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