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scsi: dc395x: fix DMA API usage in sg_update_list

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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>
This commit is contained in:
Christoph Hellwig 2018-10-11 16:17:15 +02:00 committed by Martin K. Petersen
parent 3a5bd70211
commit 6c404a68bf
1 changed files with 5 additions and 0 deletions
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5
drivers/scsi/dc395x.c
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@ -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;