[SCSI] sym53c8xx: 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>
Cc: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

2 files changed, 12 insertions, 73 deletions

diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.c b/drivers/scsi/sym53c8xx_2/sym_glue.c
index 4d78c7e87cca..15a51459c81f 100644
--- a/drivers/scsi/sym53c8xx_2/sym_glue.c
+++ b/drivers/scsi/sym53c8xx_2/sym_glue.c
@@ -146,41 +146,17 @@ struct sym_ucmd {		/* Override the SCSI pointer structure */
 
 static void __unmap_scsi_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
 {
-        int dma_dir = cmd->sc_data_direction;
+        if (SYM_UCMD_PTR(cmd)->data_mapped)
+                scsi_dma_unmap(cmd);
 
-        switch(SYM_UCMD_PTR(cmd)->data_mapped) {
-        case 2:
-                pci_unmap_sg(pdev, cmd->request_buffer, cmd->use_sg, dma_dir);
-                break;
-        case 1:
-                pci_unmap_single(pdev, SYM_UCMD_PTR(cmd)->data_mapping,
-                                 cmd->request_bufflen, dma_dir);
-                break;
-        }
         SYM_UCMD_PTR(cmd)->data_mapped = 0;
 }
 
-static dma_addr_t __map_scsi_single_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
-{
-        dma_addr_t mapping;
-        int dma_dir = cmd->sc_data_direction;
-
-        mapping = pci_map_single(pdev, cmd->request_buffer,
-                                 cmd->request_bufflen, dma_dir);
-        if (mapping) {
-                SYM_UCMD_PTR(cmd)->data_mapped  = 1;
-                SYM_UCMD_PTR(cmd)->data_mapping = mapping;
-        }
-
-        return mapping;
-}
-
 static int __map_scsi_sg_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
 {
         int use_sg;
-        int dma_dir = cmd->sc_data_direction;
 
-        use_sg = pci_map_sg(pdev, cmd->request_buffer, cmd->use_sg, dma_dir);
+        use_sg = scsi_dma_map(cmd);
         if (use_sg > 0) {
                 SYM_UCMD_PTR(cmd)->data_mapped  = 2;
                 SYM_UCMD_PTR(cmd)->data_mapping = use_sg;
@@ -191,8 +167,6 @@ static int __map_scsi_sg_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
 
 #define unmap_scsi_data(np, cmd)        \
                 __unmap_scsi_data(np->s.device, cmd)
-#define map_scsi_single_data(np, cmd)   \
-                __map_scsi_single_data(np->s.device, cmd)
 #define map_scsi_sg_data(np, cmd)       \
                 __map_scsi_sg_data(np->s.device, cmd)
 /*
@@ -322,55 +296,20 @@ void sym_set_cam_result_error(struct sym_hcb *np, struct sym_ccb *cp, int resid)
                  */
                 cam_status = sym_xerr_cam_status(DID_ERROR, cp->xerr_status);
         }
-        cmd->resid = resid;
+        scsi_set_resid(cmd, resid);
         cmd->result = (drv_status << 24) + (cam_status << 16) + scsi_status;
 }
 
-
-/*
- *  Build the scatter/gather array for an I/O.
- */
-
-static int sym_scatter_no_sglist(struct sym_hcb *np, struct sym_ccb *cp, struct scsi_cmnd *cmd)
-{
-        struct sym_tblmove *data = &cp->phys.data[SYM_CONF_MAX_SG-1];
-        int segment;
-        unsigned int len = cmd->request_bufflen;
-
-        if (len) {
-                dma_addr_t baddr = map_scsi_single_data(np, cmd);
-                if (baddr) {
-                        if (len & 1) {
-                                struct sym_tcb *tp = &np->target[cp->target];
-                                if (tp->head.wval & EWS) {
-                                        len++;
-                                        cp->odd_byte_adjustment++;
-                                }
-                        }
-                        cp->data_len = len;
-                        sym_build_sge(np, data, baddr, len);
-                        segment = 1;
-                } else {
-                        segment = -2;
-                }
-        } else {
-                segment = 0;
-        }
-
-        return segment;
-}
-
 static int sym_scatter(struct sym_hcb *np, struct sym_ccb *cp, struct scsi_cmnd *cmd)
 {
         int segment;
-        int use_sg = (int) cmd->use_sg;
+        int use_sg;
 
         cp->data_len = 0;
 
-        if (!use_sg)
-                segment = sym_scatter_no_sglist(np, cp, cmd);
-        else if ((use_sg = map_scsi_sg_data(np, cmd)) > 0) {
-                struct scatterlist *scatter = (struct scatterlist *)cmd->request_buffer;
+        use_sg = map_scsi_sg_data(np, cmd);
+        if (use_sg > 0) {
+                struct scatterlist *sg;
                 struct sym_tcb *tp = &np->target[cp->target];
                 struct sym_tblmove *data;
 
@@ -381,9 +320,9 @@ static int sym_scatter(struct sym_hcb *np, struct sym_ccb *cp, struct scsi_cmnd
 
                 data = &cp->phys.data[SYM_CONF_MAX_SG - use_sg];
 
-                for (segment = 0; segment < use_sg; segment++) {
-                        dma_addr_t baddr = sg_dma_address(&scatter[segment]);
-                        unsigned int len = sg_dma_len(&scatter[segment]);
+                scsi_for_each_sg(cmd, sg, use_sg, segment) {
+                        dma_addr_t baddr = sg_dma_address(sg);
+                        unsigned int len = sg_dma_len(sg);
 
                         if ((len & 1) && (tp->head.wval & EWS)) {
                                 len++;
diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.h b/drivers/scsi/sym53c8xx_2/sym_glue.h
index e022d3c71b59..0f097ba4f712 100644
--- a/drivers/scsi/sym53c8xx_2/sym_glue.h
+++ b/drivers/scsi/sym53c8xx_2/sym_glue.h
@@ -255,7 +255,7 @@ sym_get_cam_status(struct scsi_cmnd *cmd)
  */
 static __inline void sym_set_cam_result_ok(struct sym_ccb *cp, struct scsi_cmnd *cmd, int resid)
 {
-        cmd->resid = resid;
+        scsi_set_resid(cmd, resid);
         cmd->result = (((DID_OK) << 16) + ((cp->ssss_status) & 0x7f));
 }
 void sym_set_cam_result_error(struct sym_hcb *np, struct sym_ccb *cp, int resid);