lpfc 8.1.7 : Consolidate dma buf cleanup into a separate function

diff -upNr a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -153,22 +153,6 @@ static void
 lpfc_release_scsi_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
 {
 	unsigned long iflag = 0;
-	/*
-	 * There are only two special cases to consider.  (1) the scsi command
-	 * requested scatter-gather usage or (2) the scsi command allocated
-	 * a request buffer, but did not request use_sg.  There is a third
-	 * case, but it does not require resource deallocation.
-	 */
-	if ((psb->seg_cnt > 0) && (psb->pCmd->use_sg)) {
-		dma_unmap_sg(&phba->pcidev->dev, psb->pCmd->request_buffer,
-				psb->seg_cnt, psb->pCmd->sc_data_direction);
-	} else {
-		 if ((psb->nonsg_phys) && (psb->pCmd->request_bufflen)) {
-			dma_unmap_single(&phba->pcidev->dev, psb->nonsg_phys,
-						psb->pCmd->request_bufflen,
-						psb->pCmd->sc_data_direction);
-		 }
-	}
 
 	spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
 	psb->pCmd = NULL;

@@ -282,6 +266,27 @@ lpfc_scsi_prep_dma_buf(struct lpfc_hba *
 }
 
 static void
+lpfc_scsi_unprep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
+{
+	/*
+	 * There are only two special cases to consider.  (1) the scsi command
+	 * requested scatter-gather usage or (2) the scsi command allocated
+	 * a request buffer, but did not request use_sg.  There is a third
+	 * case, but it does not require resource deallocation.
+	 */
+	if ((psb->seg_cnt > 0) && (psb->pCmd->use_sg)) {
+		dma_unmap_sg(&phba->pcidev->dev, psb->pCmd->request_buffer,
+				psb->seg_cnt, psb->pCmd->sc_data_direction);
+	} else {
+		 if ((psb->nonsg_phys) && (psb->pCmd->request_bufflen)) {
+			dma_unmap_single(&phba->pcidev->dev, psb->nonsg_phys,
+						psb->pCmd->request_bufflen,
+						psb->pCmd->sc_data_direction);
+		 }
+	}
+}
+
+static void
 lpfc_handle_fcp_err(struct lpfc_scsi_buf *lpfc_cmd)
 {
 	struct scsi_cmnd *cmnd = lpfc_cmd->pCmd;

@@ -454,6 +459,7 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba 
 	cmd->scsi_done(cmd);
 
 	if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
+		lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
 		lpfc_release_scsi_buf(phba, lpfc_cmd);
 		return;
 	}

@@ -511,6 +517,7 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba 
 		}
 	}
 
+	lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
 	lpfc_release_scsi_buf(phba, lpfc_cmd);
 }
 

@@ -822,6 +829,7 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd
 	return 0;
 
  out_host_busy_free_buf:
+	lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
 	lpfc_release_scsi_buf(phba, lpfc_cmd);
  out_host_busy:
 	return SCSI_MLQUEUE_HOST_BUSY;