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[SCSI] ps3rom: use sg buffer copy helper funcitons

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Note that if scsi_bufflen(cmd) is not zero, the command always has an
sg list. So this patch doesn't do the error checking in
fill_from_dev_buffer and fetch_to_dev_buffer did.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Looks-OK-to: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
FUJITA Tomonori 2008-03-09 13:44:31 +09:00 committed by James Bottomley
parent 21a6182924
commit 944cf8b4cb
1 changed files with 10 additions and 82 deletions
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92
drivers/scsi/ps3rom.c
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@ -90,76 +90,6 @@ static int ps3rom_slave_configure(struct scsi_device *scsi_dev)
return 0;
}
/*
* copy data from device into scatter/gather buffer
*/
static int fill_from_dev_buffer(struct scsi_cmnd *cmd, const void *buf)
{
int k, req_len, len, fin;
void *kaddr;
struct scatterlist *sgpnt;
unsigned int buflen;
buflen = scsi_bufflen(cmd);
if (!buflen)
return 0;
if (!scsi_sglist(cmd))
return -1;
req_len = fin = 0;
scsi_for_each_sg(cmd, sgpnt, scsi_sg_count(cmd), k) {
kaddr = kmap_atomic(sg_page(sgpnt), KM_IRQ0);
len = sgpnt->length;
if ((req_len + len) > buflen) {
len = buflen - req_len;
fin = 1;
}
memcpy(kaddr + sgpnt->offset, buf + req_len, len);
flush_kernel_dcache_page(sg_page(sgpnt));
kunmap_atomic(kaddr, KM_IRQ0);
req_len += len;
if (fin)
break;
}
scsi_set_resid(cmd, buflen - req_len);
return 0;
}
/*
* copy data from scatter/gather into device's buffer
*/
static int fetch_to_dev_buffer(struct scsi_cmnd *cmd, void *buf)
{
int k, req_len, len, fin;
void *kaddr;
struct scatterlist *sgpnt;
unsigned int buflen;
buflen = scsi_bufflen(cmd);
if (!buflen)
return 0;
if (!scsi_sglist(cmd))
return -1;
req_len = fin = 0;
scsi_for_each_sg(cmd, sgpnt, scsi_sg_count(cmd), k) {
kaddr = kmap_atomic(sg_page(sgpnt), KM_IRQ0);
len = sgpnt->length;
if ((req_len + len) > buflen) {
len = buflen - req_len;
fin = 1;
}
memcpy(buf + req_len, kaddr + sgpnt->offset, len);
kunmap_atomic(kaddr, KM_IRQ0);
if (fin)
return req_len + len;
req_len += sgpnt->length;
}
return req_len;
}
static int ps3rom_atapi_request(struct ps3_storage_device *dev,
struct scsi_cmnd *cmd)
{
@ -193,9 +123,7 @@ static int ps3rom_atapi_request(struct ps3_storage_device *dev,
else
atapi_cmnd.proto = PIO_DATA_OUT_PROTO;
atapi_cmnd.in_out = DIR_WRITE;
res = fetch_to_dev_buffer(cmd, dev->bounce_buf);
if (res < 0)
return DID_ERROR << 16;
scsi_sg_copy_to_buffer(cmd, dev->bounce_buf, dev->bounce_size);
break;
default:
@ -267,9 +195,7 @@ static int ps3rom_write_request(struct ps3_storage_device *dev,
dev_dbg(&dev->sbd.core, "%s:%u: write %u sectors starting at %u\n",
__func__, __LINE__, sectors, start_sector);
res = fetch_to_dev_buffer(cmd, dev->bounce_buf);
if (res < 0)
return DID_ERROR << 16;
scsi_sg_copy_to_buffer(cmd, dev->bounce_buf, dev->bounce_size);
res = lv1_storage_write(dev->sbd.dev_id,
dev->regions[dev->region_idx].id, start_sector,
@ -379,11 +305,13 @@ static irqreturn_t ps3rom_interrupt(int irq, void *data)
if (!status) {
/* OK, completed */
if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
res = fill_from_dev_buffer(cmd, dev->bounce_buf);
if (res) {
cmd->result = DID_ERROR << 16;
goto done;
}
int len;
len = scsi_sg_copy_from_buffer(cmd,
dev->bounce_buf,
dev->bounce_size);
scsi_set_resid(cmd, scsi_bufflen(cmd) - len);
}
cmd->result = DID_OK << 16;
goto done;
@ -425,7 +353,7 @@ static struct scsi_host_template ps3rom_host_template = {
.cmd_per_lun = 1,
.emulated = 1, /* only sg driver uses this */
.max_sectors = PS3ROM_MAX_SECTORS,
.use_clustering = DISABLE_CLUSTERING,
.use_clustering = ENABLE_CLUSTERING,
.module = THIS_MODULE,
};