[SCSI] eata: fix the data buffer accessors conversion regression

This fixes the regression introduced by the commit
58e2a02eb18393e76a469580fedf7caec190eb5e (eata: convert to use the
data buffer accessors), reported:

http://marc.info/?t=122987621300006&r=1&w=2

- fix DMA_NONE handling in map_dma()

- this driver can't use scsi_dma_map since host->shost_gendev.parent
is not set properly (it uses scsi_register).

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Reported-by: Arthur Marsh <arthur.marsh@internode.on.net>
Tested-by: Arthur Marsh <arthur.marsh@internode.on.net>
Cc: stable@kernel.org
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 12 insertions, 3 deletions

diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c
index a73a6bbb1b2b..976cdd5c94ef 100644
--- a/drivers/scsi/eata.c
+++ b/drivers/scsi/eata.c
@@ -1626,8 +1626,15 @@ static void map_dma(unsigned int i, struct hostdata *ha)
 
         cpp->sense_len = SCSI_SENSE_BUFFERSIZE;
 
-        count = scsi_dma_map(SCpnt);
-        BUG_ON(count < 0);
+        if (!scsi_sg_count(SCpnt)) {
+                cpp->data_len = 0;
+                return;
+        }
+
+        count = pci_map_sg(ha->pdev, scsi_sglist(SCpnt), scsi_sg_count(SCpnt),
+                           pci_dir);
+        BUG_ON(!count);
+
         scsi_for_each_sg(SCpnt, sg, count, k) {
                 cpp->sglist[k].address = H2DEV(sg_dma_address(sg));
                 cpp->sglist[k].num_bytes = H2DEV(sg_dma_len(sg));
@@ -1655,7 +1662,9 @@ static void unmap_dma(unsigned int i, struct hostdata *ha)
                 pci_unmap_single(ha->pdev, DEV2H(cpp->sense_addr),
                                  DEV2H(cpp->sense_len), PCI_DMA_FROMDEVICE);
 
-        scsi_dma_unmap(SCpnt);
+        if (scsi_sg_count(SCpnt))
+                pci_unmap_sg(ha->pdev, scsi_sglist(SCpnt), scsi_sg_count(SCpnt),
+                             pci_dir);
 
         if (!DEV2H(cpp->data_len))
                 pci_dir = PCI_DMA_BIDIRECTIONAL;