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[SCSI] ncr53c8xx: 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>
This commit is contained in:
FUJITA Tomonori 2007-05-14 19:22:21 +09:00 committed by James Bottomley
parent 938febd62b
commit 69eca4f52b
1 changed files with 11 additions and 59 deletions
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70
drivers/scsi/ncr53c8xx.c
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@ -529,43 +529,20 @@ static void __unmap_scsi_data(struct device *dev, struct scsi_cmnd *cmd)
{
switch(cmd->__data_mapped) {
case 2:
dma_unmap_sg(dev, cmd->request_buffer, cmd->use_sg,
cmd->sc_data_direction);
break;
case 1:
dma_unmap_single(dev, cmd->__data_mapping,
cmd->request_bufflen,
cmd->sc_data_direction);
scsi_dma_unmap(cmd);
break;
}
cmd->__data_mapped = 0;
}
static u_long __map_scsi_single_data(struct device *dev, struct scsi_cmnd *cmd)
{
dma_addr_t mapping;
if (cmd->request_bufflen == 0)
return 0;
mapping = dma_map_single(dev, cmd->request_buffer,
cmd->request_bufflen,
cmd->sc_data_direction);
cmd->__data_mapped = 1;
cmd->__data_mapping = mapping;
return mapping;
}
static int __map_scsi_sg_data(struct device *dev, struct scsi_cmnd *cmd)
{
int use_sg;
if (cmd->use_sg == 0)
use_sg = scsi_dma_map(cmd);
if (!use_sg)
return 0;
use_sg = dma_map_sg(dev, cmd->request_buffer, cmd->use_sg,
cmd->sc_data_direction);
cmd->__data_mapped = 2;
cmd->__data_mapping = use_sg;
@ -573,7 +550,6 @@ static int __map_scsi_sg_data(struct device *dev, struct scsi_cmnd *cmd)
}
#define unmap_scsi_data(np, cmd) __unmap_scsi_data(np->dev, cmd)
#define map_scsi_single_data(np, cmd) __map_scsi_single_data(np->dev, cmd)
#define map_scsi_sg_data(np, cmd) __map_scsi_sg_data(np->dev, cmd)
/*==========================================================
@ -7667,39 +7643,16 @@ fail:
** sizes to the data segment array.
*/
static int ncr_scatter_no_sglist(struct ncb *np, struct ccb *cp, struct scsi_cmnd *cmd)
{
struct scr_tblmove *data = &cp->phys.data[MAX_SCATTER - 1];
int segment;
cp->data_len = cmd->request_bufflen;
if (cmd->request_bufflen) {
dma_addr_t baddr = map_scsi_single_data(np, cmd);
if (baddr) {
ncr_build_sge(np, data, baddr, cmd->request_bufflen);
segment = 1;
} else {
segment = -2;
}
} else {
segment = 0;
}
return segment;
}
static int ncr_scatter(struct ncb *np, struct ccb *cp, struct scsi_cmnd *cmd)
{
int segment = 0;
int use_sg = (int) cmd->use_sg;
int use_sg = scsi_sg_count(cmd);
cp->data_len = 0;
if (!use_sg)
segment = ncr_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 scr_tblmove *data;
if (use_sg > MAX_SCATTER) {
@ -7709,16 +7662,15 @@ static int ncr_scatter(struct ncb *np, struct ccb *cp, struct scsi_cmnd *cmd)
data = &cp->phys.data[MAX_SCATTER - 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);
ncr_build_sge(np, &data[segment], baddr, len);
cp->data_len += len;
}
} else {
} else
segment = -2;
}
return segment;
}