From 6c404a68bf83b4135a8a9aa1c388ebdf98e8ba7f Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Thu, 11 Oct 2018 16:17:15 +0200
Subject: [PATCH] scsi: dc395x: fix DMA API usage in sg_update_list
We need to transfer device ownership to the CPU before we can manipulate
the mapped data.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
---
drivers/scsi/dc395x.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/scsi/dc395x.c b/drivers/scsi/dc395x.c
index 8d7a26a3395185..f3b65e5efe2b5e 100644
--- a/drivers/scsi/dc395x.c
+++ b/drivers/scsi/dc395x.c
@@ -1871,6 +1871,11 @@ static void sg_update_list(struct ScsiReqBlk *srb, u32 left)
xferred -= psge->length;
} else {
/* Partial SG entry done */
+ pci_dma_sync_single_for_cpu(srb->dcb->
+ acb->dev,
+ srb->sg_bus_addr,
+ SEGMENTX_LEN,
+ PCI_DMA_TODEVICE);
psge->length -= xferred;
psge->address += xferred;
srb->sg_index = idx;
--
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