From: James Smart <jsmart2021@gmail.com>
Date: Tue, 30 Jan 2018 15:59:00 -0800
Subject: scsi: lpfc: Treat SCSI Write operation Underruns as an error
Patch-mainline: v4.17-rc1
Git-commit: 45634a86ca6e98dbcaddb763f8e90ad243057789
References: bsc#1080657

Currently, write underruns (mismatch of amount transferred vs scsi
status and its residual) detected by the adapter are not being flagged
as an error. Its expected the target controls the data transfer and
would appropriately set the RSP values.  Only read underruns are treated
as errors.

Revise the SCSI error handling to treat write underruns as an error as
well.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 drivers/scsi/lpfc/lpfc_scsi.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -3772,20 +3772,18 @@ lpfc_handle_fcp_err(struct lpfc_vport *v
 		scsi_set_resid(cmnd, be32_to_cpu(fcprsp->rspResId));
 
 		lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP_UNDER,
-				 "9025 FCP Read Underrun, expected %d, "
+				 "9025 FCP Underrun, expected %d, "
 				 "residual %d Data: x%x x%x x%x\n",
 				 fcpDl,
 				 scsi_get_resid(cmnd), fcpi_parm, cmnd->cmnd[0],
 				 cmnd->underflow);
 
 		/*
-		 * If there is an under run check if under run reported by
+		 * If there is an under run, check if under run reported by
 		 * storage array is same as the under run reported by HBA.
 		 * If this is not same, there is a dropped frame.
 		 */
-		if ((cmnd->sc_data_direction == DMA_FROM_DEVICE) &&
-			fcpi_parm &&
-			(scsi_get_resid(cmnd) != fcpi_parm)) {
+		if (fcpi_parm && (scsi_get_resid(cmnd) != fcpi_parm)) {
 			lpfc_printf_vlog(vport, KERN_WARNING,
 					 LOG_FCP | LOG_FCP_ERROR,
 					 "9026 FCP Read Check Error "