[PATCH 4/8] lpfc: Fix oops when unloading driver while running mds diags

[James Smart <jsmart2021@gmail.com>]

While mds diagnostic tests are running, if the driver is requested to be
unloaded, oops or hangs are observed.  The driver doesn't terminate the
processing of diag frames when the unload is started. As such: oops may
be seen for __lpfc_sli_release_iocbq_s4 because ring memory is referenced
that was already freed; or hangs see in lpfc_nvme_wait_for_io_drain as
ios no longer complete.

If unloading, don't process diag frames. Just clean them up.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
---
 drivers/scsi/lpfc/lpfc_sli.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 8582b51b0613..4cd7ded656b7 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -13650,7 +13650,11 @@ lpfc_sli4_sp_handle_rcqe(struct lpfc_hba *phba, struct lpfc_rcqe *rcqe)
 		    fc_hdr->fh_r_ctl == FC_RCTL_DD_UNSOL_DATA) {
 			spin_unlock_irqrestore(&phba->hbalock, iflags);
 			/* Handle MDS Loopback frames */
-			lpfc_sli4_handle_mds_loopback(phba->pport, dma_buf);
+			if  (!(phba->pport->load_flag & FC_UNLOADING))
+				lpfc_sli4_handle_mds_loopback(phba->pport,
+							      dma_buf);
+			else
+				lpfc_in_buf_free(phba, &dma_buf->dbuf);
 			break;
 		}
 
@@ -18363,7 +18367,10 @@ lpfc_sli4_handle_received_buffer(struct lpfc_hba *phba,
 	    fc_hdr->fh_r_ctl == FC_RCTL_DD_UNSOL_DATA) {
 		vport = phba->pport;
 		/* Handle MDS Loopback frames */
-		lpfc_sli4_handle_mds_loopback(vport, dmabuf);
+		if  (!(phba->pport->load_flag & FC_UNLOADING))
+			lpfc_sli4_handle_mds_loopback(vport, dmabuf);
+		else
+			lpfc_in_buf_free(phba, &dmabuf->dbuf);
 		return;
 	}
 
-- 
2.26.2