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scsi: dc395x: fix dma API usage in srb_done

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[ Upstream commit 3a5bd7021184dec2946f2a4d7a8943f8a5713e52 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Christoph Hellwig 2018-10-11 16:17:14 +02:00 committed by prashantpaddune
parent 30eed95dd8
commit d61ac0d4e6
1 changed files with 2 additions and 5 deletions
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7
drivers/scsi/dc395x.c
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@ -3450,14 +3450,12 @@ static void srb_done(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
}
}
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 AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
cmd, cmd->result);
srb_free_insert(acb, srb);
}
pci_unmap_srb(acb, srb);
cmd->scsi_done(cmd);
waiting_process_next(acb);