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[SCSI] ps3rom: Simplify fill_from_dev_buffer()

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As we no longer need to calculate the data length of the whole scatterlist,
we can abort the loop earlier and coalesce req_len and act_len into one
variable, making fill_from_dev_buffer() more similar to fetch_to_dev_buffer().

Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Geert Uytterhoeven 2008-02-25 14:24:31 +01:00 committed by James Bottomley
parent d1e4c9c57c
commit f7441a791a
1 changed files with 14 additions and 16 deletions
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30
drivers/scsi/ps3rom.c
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@ -95,7 +95,7 @@ static int ps3rom_slave_configure(struct scsi_device *scsi_dev)
*/
static int fill_from_dev_buffer(struct scsi_cmnd *cmd, const void *buf)
{
int k, req_len, act_len, len, active;
int k, req_len, len, fin;
void *kaddr;
struct scatterlist *sgpnt;
unsigned int buflen;
@ -107,24 +107,22 @@ static int fill_from_dev_buffer(struct scsi_cmnd *cmd, const void *buf)
if (!scsi_sglist(cmd))
return -1;
active = 1;
req_len = act_len = 0;
req_len = fin = 0;
scsi_for_each_sg(cmd, sgpnt, scsi_sg_count(cmd), k) {
if (active) {
kaddr = kmap_atomic(sg_page(sgpnt), KM_IRQ0);
len = sgpnt->length;
if ((req_len + len) > buflen) {
active = 0;
len = buflen - req_len;
}
memcpy(kaddr + sgpnt->offset, buf + req_len, len);
flush_kernel_dcache_page(sg_page(sgpnt));
kunmap_atomic(kaddr, KM_IRQ0);
act_len += len;
kaddr = kmap_atomic(sg_page(sgpnt), KM_IRQ0);
len = sgpnt->length;
if ((req_len + len) > buflen) {
len = buflen - req_len;
fin = 1;
}
req_len += sgpnt->length;
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 - act_len);
scsi_set_resid(cmd, buflen - req_len);
return 0;
}