[SCSI] ipr: 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.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 40 insertions, 104 deletions

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 4baa79e68679..6411c458d336 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -540,32 +540,6 @@ struct ipr_cmnd *ipr_get_free_ipr_cmnd(struct ipr_ioa_cfg *ioa_cfg)
 }
 
 /**
- * ipr_unmap_sglist - Unmap scatterlist if mapped
- * @ioa_cfg:    ioa config struct
- * @ipr_cmd:    ipr command struct
- *
- * Return value:
- *      nothing
- **/
-static void ipr_unmap_sglist(struct ipr_ioa_cfg *ioa_cfg,
-                             struct ipr_cmnd *ipr_cmd)
-{
-        struct scsi_cmnd *scsi_cmd = ipr_cmd->scsi_cmd;
-
-        if (ipr_cmd->dma_use_sg) {
-                if (scsi_cmd->use_sg > 0) {
-                        pci_unmap_sg(ioa_cfg->pdev, scsi_cmd->request_buffer,
-                                     scsi_cmd->use_sg,
-                                     scsi_cmd->sc_data_direction);
-                } else {
-                        pci_unmap_single(ioa_cfg->pdev, ipr_cmd->dma_handle,
-                                         scsi_cmd->request_bufflen,
-                                         scsi_cmd->sc_data_direction);
-                }
-        }
-}
-
-/**
  * ipr_mask_and_clear_interrupts - Mask all and clear specified interrupts
  * @ioa_cfg:    ioa config struct
  * @clr_ints:     interrupts to clear
@@ -677,7 +651,7 @@ static void ipr_scsi_eh_done(struct ipr_cmnd *ipr_cmd)
 
         scsi_cmd->result |= (DID_ERROR << 16);
 
-        ipr_unmap_sglist(ioa_cfg, ipr_cmd);
+        scsi_dma_unmap(ipr_cmd->scsi_cmd);
         scsi_cmd->scsi_done(scsi_cmd);
         list_add_tail(&ipr_cmd->queue, &ioa_cfg->free_q);
 }
@@ -4285,93 +4259,55 @@ static irqreturn_t ipr_isr(int irq, void *devp)
 static int ipr_build_ioadl(struct ipr_ioa_cfg *ioa_cfg,
                            struct ipr_cmnd *ipr_cmd)
 {
-        int i;
-        struct scatterlist *sglist;
+        int i, nseg;
+        struct scatterlist *sg;
         u32 length;
         u32 ioadl_flags = 0;
         struct scsi_cmnd *scsi_cmd = ipr_cmd->scsi_cmd;
         struct ipr_ioarcb *ioarcb = &ipr_cmd->ioarcb;
         struct ipr_ioadl_desc *ioadl = ipr_cmd->ioadl;
 
-        length = scsi_cmd->request_bufflen;
-
-        if (length == 0)
+        length = scsi_bufflen(scsi_cmd);
+        if (!length)
                 return 0;
 
-        if (scsi_cmd->use_sg) {
-                ipr_cmd->dma_use_sg = pci_map_sg(ioa_cfg->pdev,
-                                                 scsi_cmd->request_buffer,
-                                                 scsi_cmd->use_sg,
-                                                 scsi_cmd->sc_data_direction);
-
-                if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE) {
-                        ioadl_flags = IPR_IOADL_FLAGS_WRITE;
-                        ioarcb->cmd_pkt.flags_hi |= IPR_FLAGS_HI_WRITE_NOT_READ;
-                        ioarcb->write_data_transfer_length = cpu_to_be32(length);
-                        ioarcb->write_ioadl_len =
-                                cpu_to_be32(sizeof(struct ipr_ioadl_desc) * ipr_cmd->dma_use_sg);
-                } else if (scsi_cmd->sc_data_direction == DMA_FROM_DEVICE) {
-                        ioadl_flags = IPR_IOADL_FLAGS_READ;
-                        ioarcb->read_data_transfer_length = cpu_to_be32(length);
-                        ioarcb->read_ioadl_len =
-                                cpu_to_be32(sizeof(struct ipr_ioadl_desc) * ipr_cmd->dma_use_sg);
-                }
-
-                sglist = scsi_cmd->request_buffer;
+        nseg = scsi_dma_map(scsi_cmd);
+        if (nseg < 0) {
+                dev_err(&ioa_cfg->pdev->dev, "pci_map_sg failed!\n");
+                return -1;
+        }
 
-                if (ipr_cmd->dma_use_sg <= ARRAY_SIZE(ioarcb->add_data.u.ioadl)) {
-                        ioadl = ioarcb->add_data.u.ioadl;
-                        ioarcb->write_ioadl_addr =
-                                cpu_to_be32(be32_to_cpu(ioarcb->ioarcb_host_pci_addr) +
-                                            offsetof(struct ipr_ioarcb, add_data));
-                        ioarcb->read_ioadl_addr = ioarcb->write_ioadl_addr;
-                }
+        ipr_cmd->dma_use_sg = nseg;
 
-                for (i = 0; i < ipr_cmd->dma_use_sg; i++) {
-                        ioadl[i].flags_and_data_len =
-                                cpu_to_be32(ioadl_flags | sg_dma_len(&sglist[i]));
-                        ioadl[i].address =
-                                cpu_to_be32(sg_dma_address(&sglist[i]));
-                }
+        if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE) {
+                ioadl_flags = IPR_IOADL_FLAGS_WRITE;
+                ioarcb->cmd_pkt.flags_hi |= IPR_FLAGS_HI_WRITE_NOT_READ;
+                ioarcb->write_data_transfer_length = cpu_to_be32(length);
+                ioarcb->write_ioadl_len =
+                        cpu_to_be32(sizeof(struct ipr_ioadl_desc) * ipr_cmd->dma_use_sg);
+        } else if (scsi_cmd->sc_data_direction == DMA_FROM_DEVICE) {
+                ioadl_flags = IPR_IOADL_FLAGS_READ;
+                ioarcb->read_data_transfer_length = cpu_to_be32(length);
+                ioarcb->read_ioadl_len =
+                        cpu_to_be32(sizeof(struct ipr_ioadl_desc) * ipr_cmd->dma_use_sg);
+        }
 
-                if (likely(ipr_cmd->dma_use_sg)) {
-                        ioadl[i-1].flags_and_data_len |=
-                                cpu_to_be32(IPR_IOADL_FLAGS_LAST);
-                        return 0;
-                } else
-                        dev_err(&ioa_cfg->pdev->dev, "pci_map_sg failed!\n");
-        } else {
-                if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE) {
-                        ioadl_flags = IPR_IOADL_FLAGS_WRITE;
-                        ioarcb->cmd_pkt.flags_hi |= IPR_FLAGS_HI_WRITE_NOT_READ;
-                        ioarcb->write_data_transfer_length = cpu_to_be32(length);
-                        ioarcb->write_ioadl_len = cpu_to_be32(sizeof(struct ipr_ioadl_desc));
-                } else if (scsi_cmd->sc_data_direction == DMA_FROM_DEVICE) {
-                        ioadl_flags = IPR_IOADL_FLAGS_READ;
-                        ioarcb->read_data_transfer_length = cpu_to_be32(length);
-                        ioarcb->read_ioadl_len = cpu_to_be32(sizeof(struct ipr_ioadl_desc));
-                }
+        if (ipr_cmd->dma_use_sg <= ARRAY_SIZE(ioarcb->add_data.u.ioadl)) {
+                ioadl = ioarcb->add_data.u.ioadl;
+                ioarcb->write_ioadl_addr =
+                        cpu_to_be32(be32_to_cpu(ioarcb->ioarcb_host_pci_addr) +
+                                    offsetof(struct ipr_ioarcb, add_data));
+                ioarcb->read_ioadl_addr = ioarcb->write_ioadl_addr;
+        }
 
-                ipr_cmd->dma_handle = pci_map_single(ioa_cfg->pdev,
-                                                     scsi_cmd->request_buffer, length,
-                                                     scsi_cmd->sc_data_direction);
-
-                if (likely(!pci_dma_mapping_error(ipr_cmd->dma_handle))) {
-                        ioadl = ioarcb->add_data.u.ioadl;
-                        ioarcb->write_ioadl_addr =
-                                cpu_to_be32(be32_to_cpu(ioarcb->ioarcb_host_pci_addr) +
-                                            offsetof(struct ipr_ioarcb, add_data));
-                        ioarcb->read_ioadl_addr = ioarcb->write_ioadl_addr;
-                        ipr_cmd->dma_use_sg = 1;
-                        ioadl[0].flags_and_data_len =
-                                cpu_to_be32(ioadl_flags | length | IPR_IOADL_FLAGS_LAST);
-                        ioadl[0].address = cpu_to_be32(ipr_cmd->dma_handle);
-                        return 0;
-                } else
-                        dev_err(&ioa_cfg->pdev->dev, "pci_map_single failed!\n");
+        scsi_for_each_sg(scsi_cmd, sg, ipr_cmd->dma_use_sg, i) {
+                ioadl[i].flags_and_data_len =
+                        cpu_to_be32(ioadl_flags | sg_dma_len(sg));
+                ioadl[i].address = cpu_to_be32(sg_dma_address(sg));
         }
 
-        return -1;
+        ioadl[i-1].flags_and_data_len |= cpu_to_be32(IPR_IOADL_FLAGS_LAST);
+        return 0;
 }
 
 /**
@@ -4434,7 +4370,7 @@ static void ipr_erp_done(struct ipr_cmnd *ipr_cmd)
                         res->needs_sync_complete = 1;
                 res->in_erp = 0;
         }
-        ipr_unmap_sglist(ioa_cfg, ipr_cmd);
+        scsi_dma_unmap(ipr_cmd->scsi_cmd);
         list_add_tail(&ipr_cmd->queue, &ioa_cfg->free_q);
         scsi_cmd->scsi_done(scsi_cmd);
 }
@@ -4812,7 +4748,7 @@ static void ipr_erp_start(struct ipr_ioa_cfg *ioa_cfg,
                 break;
         }
 
-        ipr_unmap_sglist(ioa_cfg, ipr_cmd);
+        scsi_dma_unmap(ipr_cmd->scsi_cmd);
         list_add_tail(&ipr_cmd->queue, &ioa_cfg->free_q);
         scsi_cmd->scsi_done(scsi_cmd);
 }
@@ -4833,10 +4769,10 @@ static void ipr_scsi_done(struct ipr_cmnd *ipr_cmd)
         struct scsi_cmnd *scsi_cmd = ipr_cmd->scsi_cmd;
         u32 ioasc = be32_to_cpu(ipr_cmd->ioasa.ioasc);
 
-        scsi_cmd->resid = be32_to_cpu(ipr_cmd->ioasa.residual_data_len);
+        scsi_set_resid(scsi_cmd, be32_to_cpu(ipr_cmd->ioasa.residual_data_len));
 
         if (likely(IPR_IOASC_SENSE_KEY(ioasc) == 0)) {
-                ipr_unmap_sglist(ioa_cfg, ipr_cmd);
+                scsi_dma_unmap(ipr_cmd->scsi_cmd);
                 list_add_tail(&ipr_cmd->queue, &ioa_cfg->free_q);
                 scsi_cmd->scsi_done(scsi_cmd);
         } else