[PATCH 04/31] qla2xxx: Add command completion for error path

[Himanshu Madhani <himanshu.madhani@xxxxxxxxxx>]

From: Duane Grigsby <duane.grigsby@xxxxxxxxxx>

The driver held spinlocks during callbacks for NVME errors
which resulted in a deadlock because recovery LS cmds needed
the same lock.

Signed-off-by: Duane Grigsby <duane.grigsby@xxxxxxxxxx>
Signed-off-by: Himanshu Madhani <himanshu.madhani@xxxxxxxxxx>
---
 drivers/scsi/qla2xxx/qla_def.h  |  2 ++
 drivers/scsi/qla2xxx/qla_gbl.h  |  2 ++
 drivers/scsi/qla2xxx/qla_init.c |  1 +
 drivers/scsi/qla2xxx/qla_mid.c  |  7 +++++++
 drivers/scsi/qla2xxx/qla_nvme.c | 13 ++++++++++++-
 drivers/scsi/qla2xxx/qla_os.c   |  1 +
 6 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index b3e3982a9db0..e3b225cc83f2 100644
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -427,6 +427,7 @@ struct srb_iocb {
 			enum nvmefc_fcp_datadir dir;
 			uint32_t dl;
 			uint32_t timeout_sec;
+			struct	list_head   entry;
 		} nvme;
 	} u;
 
@@ -3338,6 +3339,7 @@ struct qla_qpair {
 	struct work_struct q_work;
 	struct list_head qp_list_elem; /* vha->qp_list */
 	struct list_head hints_list;
+	struct list_head nvme_done_list;
 	uint16_t cpuid;
 	struct qla_tgt_counters tgt_counters;
 };
diff --git a/drivers/scsi/qla2xxx/qla_gbl.h b/drivers/scsi/qla2xxx/qla_gbl.h
index 97dcabc790c9..f614c37efc9c 100644
--- a/drivers/scsi/qla2xxx/qla_gbl.h
+++ b/drivers/scsi/qla2xxx/qla_gbl.h
@@ -865,4 +865,6 @@ void qlt_update_host_map(struct scsi_qla_host *, port_id_t);
 void qlt_remove_target_resources(struct qla_hw_data *);
 void qlt_clr_qp_table(struct scsi_qla_host *vha);
 
+void qla_nvme_cmpl_io(struct srb_iocb *);
+
 #endif /* _QLA_GBL_H */
diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index 8f83571afc7b..988fb5d0f9e7 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -7806,6 +7806,7 @@ struct qla_qpair *qla2xxx_create_qpair(struct scsi_qla_host *vha, int qos,
 		qpair->vp_idx = vp_idx;
 		qpair->fw_started = ha->flags.fw_started;
 		INIT_LIST_HEAD(&qpair->hints_list);
+		INIT_LIST_HEAD(&qpair->nvme_done_list);
 		qpair->chip_reset = ha->base_qpair->chip_reset;
 		qpair->enable_class_2 = ha->base_qpair->enable_class_2;
 		qpair->enable_explicit_conf =
diff --git a/drivers/scsi/qla2xxx/qla_mid.c b/drivers/scsi/qla2xxx/qla_mid.c
index 3089094b48fa..608d1aeb97be 100644
--- a/drivers/scsi/qla2xxx/qla_mid.c
+++ b/drivers/scsi/qla2xxx/qla_mid.c
@@ -759,11 +759,18 @@ static void qla_do_work(struct work_struct *work)
 	struct qla_qpair *qpair = container_of(work, struct qla_qpair, q_work);
 	struct scsi_qla_host *vha;
 	struct qla_hw_data *ha = qpair->hw;
+	struct srb_iocb	*nvme, *nxt_nvme;
 
 	spin_lock_irqsave(&qpair->qp_lock, flags);
 	vha = pci_get_drvdata(ha->pdev);
 	qla24xx_process_response_queue(vha, qpair->rsp);
 	spin_unlock_irqrestore(&qpair->qp_lock, flags);
+
+	list_for_each_entry_safe(nvme, nxt_nvme, &qpair->nvme_done_list,
+		    u.nvme.entry) {
+		list_del_init(&nvme->u.nvme.entry);
+		qla_nvme_cmpl_io(nvme);
+	}
 }
 
 /* create response queue */
diff --git a/drivers/scsi/qla2xxx/qla_nvme.c b/drivers/scsi/qla2xxx/qla_nvme.c
index 97a7b222b549..5692ae128655 100644
--- a/drivers/scsi/qla2xxx/qla_nvme.c
+++ b/drivers/scsi/qla2xxx/qla_nvme.c
@@ -154,6 +154,16 @@ static void qla_nvme_sp_ls_done(void *ptr, int res)
 	qla2x00_rel_sp(sp);
 }
 
+void qla_nvme_cmpl_io(struct srb_iocb *nvme)
+{
+	srb_t *sp;
+	struct nvmefc_fcp_req *fd = nvme->u.nvme.desc;
+
+	sp = container_of(nvme, srb_t, u.iocb_cmd);
+	fd->done(fd);
+	qla2xxx_rel_qpair_sp(sp->qpair, sp);
+}
+
 static void qla_nvme_sp_done(void *ptr, int res)
 {
 	srb_t *sp = ptr;
@@ -175,7 +185,8 @@ static void qla_nvme_sp_done(void *ptr, int res)
 		fd->status = 0;
 
 	fd->rcv_rsplen = nvme->u.nvme.rsp_pyld_len;
-	fd->done(fd);
+	list_add_tail(&nvme->u.nvme.entry, &sp->qpair->nvme_done_list);
+	return;
 rel:
 	qla2xxx_rel_qpair_sp(sp->qpair, sp);
 }
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index d9a115577dc8..b43520ca6645 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -379,6 +379,7 @@ static void qla_init_base_qpair(struct scsi_qla_host *vha, struct req_que *req,
 	ha->base_qpair->use_shadow_reg = IS_SHADOW_REG_CAPABLE(ha) ? 1 : 0;
 	ha->base_qpair->msix = &ha->msix_entries[QLA_MSIX_RSP_Q];
 	INIT_LIST_HEAD(&ha->base_qpair->hints_list);
+	INIT_LIST_HEAD(&ha->base_qpair->nvme_done_list);
 	ha->base_qpair->enable_class_2 = ql2xenableclass2;
 	/* init qpair to this cpu. Will adjust at run time. */
 	qla_cpu_update(rsp->qpair, smp_processor_id());
-- 
2.12.0