[PATCH 16/22] lpfc: Fix pt2pt state transition causing rmmod hang

[James Smart <jsmart2021@gmail.com>]

On a setup with a dual port HBA and both ports direct connected, an rmmod
hangs momentarily when we log an Illegal State Transition. Once it resumes,
a nodelist not empty logic is hit, which forces rmmod to cleanup and exit.
We're missing a state transition case in the discovery engine.

Fix by adding a case for a DEVICE_RM event while in the unmapped state to
avoid illegal state transition log message.

Co-developed-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
---
 drivers/scsi/lpfc/lpfc_nportdisc.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/lpfc/lpfc_nportdisc.c b/drivers/scsi/lpfc/lpfc_nportdisc.c
index 090a4232bfa8..e178ffb4e4eb 100644
--- a/drivers/scsi/lpfc/lpfc_nportdisc.c
+++ b/drivers/scsi/lpfc/lpfc_nportdisc.c
@@ -2485,6 +2485,16 @@ lpfc_rcv_prlo_unmap_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
 	return ndlp->nlp_state;
 }
 
+static uint32_t
+lpfc_device_rm_unmap_node(struct lpfc_vport *vport,
+			  struct lpfc_nodelist *ndlp,
+			  void *arg,
+			  uint32_t evt)
+{
+	lpfc_drop_node(vport, ndlp);
+	return NLP_STE_FREED_NODE;
+}
+
 static uint32_t
 lpfc_device_recov_unmap_node(struct lpfc_vport *vport,
 			     struct lpfc_nodelist *ndlp,
@@ -2978,7 +2988,7 @@ static uint32_t (*lpfc_disc_action[NLP_STE_MAX_STATE * NLP_EVT_MAX_EVENT])
 	lpfc_disc_illegal,		/* CMPL_LOGO       */
 	lpfc_disc_illegal,		/* CMPL_ADISC      */
 	lpfc_disc_illegal,		/* CMPL_REG_LOGIN  */
-	lpfc_disc_illegal,		/* DEVICE_RM       */
+	lpfc_device_rm_unmap_node,	/* DEVICE_RM       */
 	lpfc_device_recov_unmap_node,	/* DEVICE_RECOVERY */
 
 	lpfc_rcv_plogi_mapped_node,	/* RCV_PLOGI   MAPPED_NODE    */
-- 
2.26.2