From: Christoph Hellwig <hch@lst.de>
Date: Thu, 11 Oct 2018 16:17:14 +0200
Subject: scsi: dc395x: fix dma API usage in srb_done
Git-commit: 3a5bd7021184dec2946f2a4d7a8943f8a5713e52
Patch-mainline: v4.20-rc1
References: git-fixes

We can't just transfer ownership to the CPU and then unmap, as this will
break with swiotlb.

Instead unmap the command and sense buffer a little earlier in the I/O
completion handler and get rid of the pci_dma_sync_sg_for_cpu call
entirely.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Lee Duncan <lduncan@suse.com>
---
 drivers/scsi/dc395x.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

--- a/drivers/scsi/dc395x.c
+++ b/drivers/scsi/dc395x.c
@@ -3450,14 +3450,12 @@ static void srb_done(struct AdapterCtlBl
 		}
 	}
 
-	if (dir != PCI_DMA_NONE && scsi_sg_count(cmd))
-		pci_dma_sync_sg_for_cpu(acb->dev, scsi_sglist(cmd),
-					scsi_sg_count(cmd), dir);
-
 	ckc_only = 0;
 /* Check Error Conditions */
       ckc_e:
 
+	pci_unmap_srb(acb, srb);
+
 	if (cmd->cmnd[0] == INQUIRY) {
 		unsigned char *base = NULL;
 		struct ScsiInqData *ptr;
@@ -3511,7 +3509,6 @@ static void srb_done(struct AdapterCtlBl
 			cmd, cmd->result);
 		srb_free_insert(acb, srb);
 	}
-	pci_unmap_srb(acb, srb);
 
 	cmd->scsi_done(cmd);
 	waiting_process_next(acb);