[PATCH 50/59] qla2xxx: Make sure that aborted commands are freed

[Bart Van Assche <bvanassche@xxxxxxx>]

The LIO core requires that the target driver callback functions
.queue_data_in() and .queue_status() call target_put_sess_cmd() or
transport_generic_free_cmd(). These calls may happen synchronously or
asynchronously. Make sure that one of these LIO functions is called
in case a command has been aborted. This patch avoids that the code
for removing a session hangs due to commands that do not make progress.

Cc: Himanshu Madhani <hmadhani@xxxxxxxxxxx>
Cc: Giridhar Malavali <gmalavali@xxxxxxxxxxx>
Fixes: 694833ee00c4 ("scsi: tcm_qla2xxx: Do not allow aborted cmd to advance.") # v4.13.
Fixes: a07100e00ac4 ("qla2xxx: Fix TMR ABORT interaction issue between qla2xxx and TCM") # v4.5.
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
---
 drivers/scsi/qla2xxx/qla_target.c  | 13 ++++++++-----
 drivers/scsi/qla2xxx/tcm_qla2xxx.c |  4 ++++
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index cc0c99b5f3fb..0ffda6171614 100644
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -3206,7 +3206,8 @@ int qlt_xmit_response(struct qla_tgt_cmd *cmd, int xmit_type,
 	if (!qpair->fw_started || (cmd->reset_count != qpair->chip_reset) ||
 	    (cmd->sess && cmd->sess->deleted)) {
 		cmd->state = QLA_TGT_STATE_PROCESSED;
-		return 0;
+		res = 0;
+		goto free;
 	}
 
 	ql_dbg_qp(ql_dbg_tgt, qpair, 0xe018,
@@ -3217,9 +3218,8 @@ int qlt_xmit_response(struct qla_tgt_cmd *cmd, int xmit_type,
 
 	res = qlt_pre_xmit_response(cmd, &prm, xmit_type, scsi_status,
 	    &full_req_cnt);
-	if (unlikely(res != 0)) {
-		return res;
-	}
+	if (unlikely(res != 0))
+		goto free;
 
 	spin_lock_irqsave(qpair->qp_lock_ptr, flags);
 
@@ -3239,7 +3239,8 @@ int qlt_xmit_response(struct qla_tgt_cmd *cmd, int xmit_type,
 			vha->flags.online, qla2x00_reset_active(vha),
 			cmd->reset_count, qpair->chip_reset);
 		spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
-		return 0;
+		res = 0;
+		goto free;
 	}
 
 	/* Does F/W have an IOCBs for this request */
@@ -3342,6 +3343,8 @@ int qlt_xmit_response(struct qla_tgt_cmd *cmd, int xmit_type,
 	qlt_unmap_sg(vha, cmd);
 	spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
 
+free:
+	vha->hw->tgt.tgt_ops->free_cmd(cmd);
 	return res;
 }
 EXPORT_SYMBOL(qlt_xmit_response);
diff --git a/drivers/scsi/qla2xxx/tcm_qla2xxx.c b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
index 963c220f8ba8..042a24314edc 100644
--- a/drivers/scsi/qla2xxx/tcm_qla2xxx.c
+++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
@@ -620,6 +620,7 @@ static int tcm_qla2xxx_queue_data_in(struct se_cmd *se_cmd)
 {
 	struct qla_tgt_cmd *cmd = container_of(se_cmd,
 				struct qla_tgt_cmd, se_cmd);
+	struct scsi_qla_host *vha = cmd->vha;
 
 	if (cmd->aborted) {
 		/* Cmd can loop during Q-full.  tcm_qla2xxx_aborted_task
@@ -632,6 +633,7 @@ static int tcm_qla2xxx_queue_data_in(struct se_cmd *se_cmd)
 			cmd->se_cmd.transport_state,
 			cmd->se_cmd.t_state,
 			cmd->se_cmd.se_cmd_flags);
+		vha->hw->tgt.tgt_ops->free_cmd(cmd);
 		return 0;
 	}
 
@@ -659,6 +661,7 @@ static int tcm_qla2xxx_queue_status(struct se_cmd *se_cmd)
 {
 	struct qla_tgt_cmd *cmd = container_of(se_cmd,
 				struct qla_tgt_cmd, se_cmd);
+	struct scsi_qla_host *vha = cmd->vha;
 	int xmit_type = QLA_TGT_XMIT_STATUS;
 
 	if (cmd->aborted) {
@@ -672,6 +675,7 @@ static int tcm_qla2xxx_queue_status(struct se_cmd *se_cmd)
 		    cmd, kref_read(&cmd->se_cmd.cmd_kref),
 		    cmd->se_cmd.transport_state, cmd->se_cmd.t_state,
 		    cmd->se_cmd.se_cmd_flags);
+		vha->hw->tgt.tgt_ops->free_cmd(cmd);
 		return 0;
 	}
 	cmd->bufflen = se_cmd->data_length;
-- 
2.22.0.770.g0f2c4a37fd-goog