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

[Bart Van Assche]

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 <hmadh...@marvell.com>
Cc: Giridhar Malavali <gmalav...@marvell.com>
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 <bvanass...@acm.org>
---
 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