[SCSI] megaraid_sas: 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: Sumant Patro <sumant.patro@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 17 insertions, 95 deletions

diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index e2cf12ef3688..b7f2e613c903 100644
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -433,34 +433,15 @@ megasas_make_sgl32(struct megasas_instance *instance, struct scsi_cmnd *scp,
         int sge_count;
         struct scatterlist *os_sgl;
 
-        /*
-         * Return 0 if there is no data transfer
-         */
-        if (!scp->request_buffer || !scp->request_bufflen)
-                return 0;
+        sge_count = scsi_dma_map(scp);
+        BUG_ON(sge_count < 0);
 
-        if (!scp->use_sg) {
-                mfi_sgl->sge32[0].phys_addr = pci_map_single(instance->pdev,
-                                                             scp->
-                                                             request_buffer,
-                                                             scp->
-                                                             request_bufflen,
-                                                             scp->
-                                                             sc_data_direction);
-                mfi_sgl->sge32[0].length = scp->request_bufflen;
-
-                return 1;
-        }
-
-        os_sgl = (struct scatterlist *)scp->request_buffer;
-        sge_count = pci_map_sg(instance->pdev, os_sgl, scp->use_sg,
-                               scp->sc_data_direction);
-
-        for (i = 0; i < sge_count; i++, os_sgl++) {
-                mfi_sgl->sge32[i].length = sg_dma_len(os_sgl);
-                mfi_sgl->sge32[i].phys_addr = sg_dma_address(os_sgl);
+        if (sge_count) {
+                scsi_for_each_sg(scp, os_sgl, sge_count, i) {
+                        mfi_sgl->sge32[i].length = sg_dma_len(os_sgl);
+                        mfi_sgl->sge32[i].phys_addr = sg_dma_address(os_sgl);
+                }
         }
-
         return sge_count;
 }
 
@@ -481,35 +462,15 @@ megasas_make_sgl64(struct megasas_instance *instance, struct scsi_cmnd *scp,
         int sge_count;
         struct scatterlist *os_sgl;
 
-        /*
-         * Return 0 if there is no data transfer
-         */
-        if (!scp->request_buffer || !scp->request_bufflen)
-                return 0;
-
-        if (!scp->use_sg) {
-                mfi_sgl->sge64[0].phys_addr = pci_map_single(instance->pdev,
-                                                             scp->
-                                                             request_buffer,
-                                                             scp->
-                                                             request_bufflen,
-                                                             scp->
-                                                             sc_data_direction);
-
-                mfi_sgl->sge64[0].length = scp->request_bufflen;
-
-                return 1;
-        }
-
-        os_sgl = (struct scatterlist *)scp->request_buffer;
-        sge_count = pci_map_sg(instance->pdev, os_sgl, scp->use_sg,
-                               scp->sc_data_direction);
+        sge_count = scsi_dma_map(scp);
+        BUG_ON(sge_count < 0);
 
-        for (i = 0; i < sge_count; i++, os_sgl++) {
-                mfi_sgl->sge64[i].length = sg_dma_len(os_sgl);
-                mfi_sgl->sge64[i].phys_addr = sg_dma_address(os_sgl);
+        if (sge_count) {
+                scsi_for_each_sg(scp, os_sgl, sge_count, i) {
+                        mfi_sgl->sge64[i].length = sg_dma_len(os_sgl);
+                        mfi_sgl->sge64[i].phys_addr = sg_dma_address(os_sgl);
+                }
         }
-
         return sge_count;
 }
 
@@ -593,7 +554,7 @@ megasas_build_dcdb(struct megasas_instance *instance, struct scsi_cmnd *scp,
         pthru->cdb_len = scp->cmd_len;
         pthru->timeout = 0;
         pthru->flags = flags;
-        pthru->data_xfer_len = scp->request_bufflen;
+        pthru->data_xfer_len = scsi_bufflen(scp);
 
         memcpy(pthru->cdb, scp->cmnd, scp->cmd_len);
 
@@ -1195,45 +1156,6 @@ megasas_complete_abort(struct megasas_instance *instance,
 }
 
 /**
- * megasas_unmap_sgbuf -        Unmap SG buffers
- * @instance:                   Adapter soft state
- * @cmd:                        Completed command
- */
-static void
-megasas_unmap_sgbuf(struct megasas_instance *instance, struct megasas_cmd *cmd)
-{
-        dma_addr_t buf_h;
-        u8 opcode;
-
-        if (cmd->scmd->use_sg) {
-                pci_unmap_sg(instance->pdev, cmd->scmd->request_buffer,
-                             cmd->scmd->use_sg, cmd->scmd->sc_data_direction);
-                return;
-        }
-
-        if (!cmd->scmd->request_bufflen)
-                return;
-
-        opcode = cmd->frame->hdr.cmd;
-
-        if ((opcode == MFI_CMD_LD_READ) || (opcode == MFI_CMD_LD_WRITE)) {
-                if (IS_DMA64)
-                        buf_h = cmd->frame->io.sgl.sge64[0].phys_addr;
-                else
-                        buf_h = cmd->frame->io.sgl.sge32[0].phys_addr;
-        } else {
-                if (IS_DMA64)
-                        buf_h = cmd->frame->pthru.sgl.sge64[0].phys_addr;
-                else
-                        buf_h = cmd->frame->pthru.sgl.sge32[0].phys_addr;
-        }
-
-        pci_unmap_single(instance->pdev, buf_h, cmd->scmd->request_bufflen,
-                         cmd->scmd->sc_data_direction);
-        return;
-}
-
-/**
  * megasas_complete_cmd -       Completes a command
  * @instance:                   Adapter soft state
  * @cmd:                        Command to be completed
@@ -1281,7 +1203,7 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
 
                         atomic_dec(&instance->fw_outstanding);
 
-                        megasas_unmap_sgbuf(instance, cmd);
+                        scsi_dma_unmap(cmd->scmd);
                         cmd->scmd->scsi_done(cmd->scmd);
                         megasas_return_cmd(instance, cmd);
 
@@ -1329,7 +1251,7 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
 
                 atomic_dec(&instance->fw_outstanding);
 
-                megasas_unmap_sgbuf(instance, cmd);
+                scsi_dma_unmap(cmd->scmd);
                 cmd->scmd->scsi_done(cmd->scmd);
                 megasas_return_cmd(instance, cmd);