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authorGeert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>2008-02-25 14:24:31 +0100
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-04-07 12:15:41 -0500
commitf7441a791aeaeac2e1f1f71b485d1372016f9285 (patch)
tree25d5b16e6c9f587d0f841794f382ba6a4dc6cd90
parentd1e4c9c57c2ed4722795443db22a5d813cd4f0e5 (diff)
[SCSI] ps3rom: Simplify fill_from_dev_buffer()
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>
-rw-r--r--drivers/scsi/ps3rom.c30
1 files changed, 14 insertions, 16 deletions
diff --git a/drivers/scsi/ps3rom.c b/drivers/scsi/ps3rom.c
index fad6cb5cba2..0eed5ca1e03 100644
--- a/drivers/scsi/ps3rom.c
+++ b/drivers/scsi/ps3rom.c
@@ -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;
}