[SCSI] eata: convert to use the data buffer accessors

- remove the unnecessary map_single path.

- convert to use the new accessors for the sg lists and the
parameters.

Jens Axboe <jens.axboe@oracle.com> did the for_each_sg cleanup.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c
index 2d38025..a83e9f1 100644 (file)
--- a/drivers/scsi/eata.c
+++ b/drivers/scsi/eata.c
@@ -1609,8 +1609,9 @@ static int eata2x_detect(struct scsi_host_template *tpnt)
 
 static void map_dma(unsigned int i, struct hostdata *ha)
 {
-       unsigned int k, count, pci_dir;
-       struct scatterlist *sgpnt;
+       unsigned int k, pci_dir;
+       int count;
+       struct scatterlist *sg;
        struct mscp *cpp;
        struct scsi_cmnd *SCpnt;
 
@@ -1625,38 +1626,19 @@ static void map_dma(unsigned int i, struct hostdata *ha)
 
        cpp->sense_len = sizeof SCpnt->sense_buffer;
 
-       if (!SCpnt->use_sg) {
-
-               /* If we get here with PCI_DMA_NONE, pci_map_single triggers a BUG() */
-               if (!SCpnt->request_bufflen)
-                       pci_dir = PCI_DMA_BIDIRECTIONAL;
-
-               if (SCpnt->request_buffer)
-                       cpp->data_address = H2DEV(pci_map_single(ha->pdev,
-                                                                SCpnt->
-                                                                request_buffer,
-                                                                SCpnt->
-                                                                request_bufflen,
-                                                                pci_dir));
-
-               cpp->data_len = H2DEV(SCpnt->request_bufflen);
-               return;
-       }
-
-       sgpnt = (struct scatterlist *)SCpnt->request_buffer;
-       count = pci_map_sg(ha->pdev, sgpnt, SCpnt->use_sg, pci_dir);
-
-       for (k = 0; k < count; k++) {
-               cpp->sglist[k].address = H2DEV(sg_dma_address(&sgpnt[k]));
-               cpp->sglist[k].num_bytes = H2DEV(sg_dma_len(&sgpnt[k]));
+       count = scsi_dma_map(SCpnt);
+       BUG_ON(count < 0);
+       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));
        }
 
        cpp->sg = 1;
        cpp->data_address = H2DEV(pci_map_single(ha->pdev, cpp->sglist,
-                                                SCpnt->use_sg *
+                                                scsi_sg_count(SCpnt) *
                                                 sizeof(struct sg_list),
                                                 pci_dir));
-       cpp->data_len = H2DEV((SCpnt->use_sg * sizeof(struct sg_list)));
+       cpp->data_len = H2DEV((scsi_sg_count(SCpnt) * sizeof(struct sg_list)));
 }
 
 static void unmap_dma(unsigned int i, struct hostdata *ha)
@@ -1673,9 +1655,7 @@ 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);
 
-       if (SCpnt->use_sg)
-               pci_unmap_sg(ha->pdev, SCpnt->request_buffer, SCpnt->use_sg,
-                            pci_dir);
+       scsi_dma_unmap(SCpnt);
 
        if (!DEV2H(cpp->data_len))
                pci_dir = PCI_DMA_BIDIRECTIONAL;
@@ -1700,9 +1680,9 @@ static void sync_dma(unsigned int i, struct hostdata *ha)
                                            DEV2H(cpp->sense_len),
                                            PCI_DMA_FROMDEVICE);
 
-       if (SCpnt->use_sg)
-               pci_dma_sync_sg_for_cpu(ha->pdev, SCpnt->request_buffer,
-                                       SCpnt->use_sg, pci_dir);
+       if (scsi_sg_count(SCpnt))
+               pci_dma_sync_sg_for_cpu(ha->pdev, scsi_sglist(SCpnt),
+                                       scsi_sg_count(SCpnt), pci_dir);
 
        if (!DEV2H(cpp->data_len))
                pci_dir = PCI_DMA_BIDIRECTIONAL;