[PATCH v2 08/16] scsi: qla2xxx: clear cmds after chip reset

[Tony Battersby <tonyb@cybernetics.com>]

Commit aefed3e5548f ("scsi: qla2xxx: target: Fix offline port handling
and host reset handling") caused two problems:

1. Commands sent to FW, after chip reset got stuck and never freed as FW
   is not going to respond to them anymore.

2. BUG_ON(cmd->sg_mapped) in qlt_free_cmd().  Commit 26f9ce53817a
   ("scsi: qla2xxx: Fix missed DMA unmap for aborted commands")
   attempted to fix this, but introduced another bug under different
   circumstances when two different CPUs were racing to call
   qlt_unmap_sg() at the same time: BUG_ON(!valid_dma_direction(dir)) in
   dma_unmap_sg_attrs().

So revert "scsi: qla2xxx: Fix missed DMA unmap for aborted commands" and
partially revert "scsi: qla2xxx: target: Fix offline port handling and
host reset handling" at __qla2x00_abort_all_cmds.

Fixes: aefed3e5548f ("scsi: qla2xxx: target: Fix offline port handling and host reset handling")
Fixes: 26f9ce53817a ("scsi: qla2xxx: Fix missed DMA unmap for aborted commands")
Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Signed-off-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
---

v1 -> v2: This patch is a new addition in v2.

 drivers/scsi/qla2xxx/qla_os.c     | 20 ++++++++++++++++++--
 drivers/scsi/qla2xxx/qla_target.c |  5 +----
 drivers/scsi/qla2xxx/qla_target.h |  1 +
 3 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index f0b77f13628d..739137ddfd68 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -1875,10 +1875,26 @@ __qla2x00_abort_all_cmds(struct qla_qpair *qp, int res)
 					continue;
 				}
 				cmd = (struct qla_tgt_cmd *)sp;
-				cmd->aborted = 1;
+
+				if (cmd->sg_mapped)
+					qlt_unmap_sg(vha, cmd);
+
+				if (cmd->state == QLA_TGT_STATE_NEED_DATA) {
+					cmd->aborted = 1;
+					cmd->write_data_transferred = 0;
+					cmd->state = QLA_TGT_STATE_DATA_IN;
+					ha->tgt.tgt_ops->handle_data(cmd);
+				} else {
+					ha->tgt.tgt_ops->free_cmd(cmd);
+				}
 				break;
 			case TYPE_TGT_TMCMD:
-				/* Skip task management functions. */
+				/*
+				 * Currently, only ABTS response gets on the
+				 * outstanding_cmds[]
+				 */
+				ha->tgt.tgt_ops->free_mcmd(
+					(struct qla_tgt_mgmt_cmd *) sp);
 				break;
 			default:
 				break;
diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index b700bfc642b3..2abdb8ce0302 100644
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -2447,7 +2447,7 @@ static int qlt_pci_map_calc_cnt(struct qla_tgt_prm *prm)
 	return -1;
 }
 
-static void qlt_unmap_sg(struct scsi_qla_host *vha, struct qla_tgt_cmd *cmd)
+void qlt_unmap_sg(struct scsi_qla_host *vha, struct qla_tgt_cmd *cmd)
 {
 	struct qla_hw_data *ha;
 	struct qla_qpair *qpair;
@@ -3795,9 +3795,6 @@ int qlt_abort_cmd(struct qla_tgt_cmd *cmd)
 
 	spin_lock_irqsave(&cmd->cmd_lock, flags);
 	if (cmd->aborted) {
-		if (cmd->sg_mapped)
-			qlt_unmap_sg(vha, cmd);
-
 		spin_unlock_irqrestore(&cmd->cmd_lock, flags);
 		/*
 		 * It's normal to see 2 calls in this path:
diff --git a/drivers/scsi/qla2xxx/qla_target.h b/drivers/scsi/qla2xxx/qla_target.h
index 15a59c125c53..c483966d0a84 100644
--- a/drivers/scsi/qla2xxx/qla_target.h
+++ b/drivers/scsi/qla2xxx/qla_target.h
@@ -1058,6 +1058,7 @@ extern int qlt_abort_cmd(struct qla_tgt_cmd *);
 extern void qlt_xmit_tm_rsp(struct qla_tgt_mgmt_cmd *);
 extern void qlt_free_mcmd(struct qla_tgt_mgmt_cmd *);
 extern void qlt_free_cmd(struct qla_tgt_cmd *cmd);
+extern void qlt_unmap_sg(struct scsi_qla_host *vha, struct qla_tgt_cmd *cmd);
 extern void qlt_async_event(uint16_t, struct scsi_qla_host *, uint16_t *);
 extern void qlt_enable_vha(struct scsi_qla_host *);
 extern void qlt_vport_create(struct scsi_qla_host *, struct qla_hw_data *);
-- 
2.43.0