From: Bart Van Assche <bvanassche@acm.org>
Date: Wed, 17 Apr 2019 14:44:30 -0700
Subject: scsi: qla2xxx: Complain if a command is released that is owned by the
 firmware
Patch-mainline: v5.2-rc1
Git-commit: b1e261d4a4b71d67b62f6649c5496810c28e7ac1
References: bsc#1082635 bsc#1123034 bsc#1131304 bsc#1127988 bsc#1141340 bsc#1143706

The previous patch guarantees that a command is only released after the
firmware has finished processing it. Hence complain if a command is
released that is owned by the firmware.

Cc: Himanshu Madhani <hmadhani@marvell.com>
Cc: Giridhar Malavali <gmalavali@marvell.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
 drivers/scsi/qla2xxx/tcm_qla2xxx.c |   13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

--- a/drivers/scsi/qla2xxx/tcm_qla2xxx.c
+++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
@@ -330,7 +330,6 @@ static int tcm_qla2xxx_check_stop_free(s
 static void tcm_qla2xxx_release_cmd(struct se_cmd *se_cmd)
 {
 	struct qla_tgt_cmd *cmd;
-	unsigned long flags;
 
 	if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) {
 		struct qla_tgt_mgmt_cmd *mcmd = container_of(se_cmd,
@@ -340,14 +339,10 @@ static void tcm_qla2xxx_release_cmd(stru
 	}
 	cmd = container_of(se_cmd, struct qla_tgt_cmd, se_cmd);
 
-	spin_lock_irqsave(&cmd->cmd_lock, flags);
-	if (cmd->cmd_sent_to_fw) {
-		cmd->released = 1;
-		spin_unlock_irqrestore(&cmd->cmd_lock, flags);
-	} else {
-		spin_unlock_irqrestore(&cmd->cmd_lock, flags);
-		qlt_free_cmd(cmd);
-	}
+	if (WARN_ON(cmd->cmd_sent_to_fw))
+		return;
+
+	qlt_free_cmd(cmd);
 }
 
 static void tcm_qla2xxx_release_session(struct kref *kref)