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authorBen Collins <bcollins@ubuntu.com>2006-06-12 17:52:59 -0400
committerBen Collins <bcollins@ubuntu.com>2006-06-12 17:52:59 -0400
commit9bb2bcdb4b6f9a04363c8ea4cf72c592d6c7af71 (patch)
tree5821a1f75856b45997856f19c0760a932d9709d0 /drivers/ieee1394
parentf54b1bdff1b470ff4461de3a73a7ceaf3a52e10a (diff)
downloadlwn-9bb2bcdb4b6f9a04363c8ea4cf72c592d6c7af71.tar.gz
lwn-9bb2bcdb4b6f9a04363c8ea4cf72c592d6c7af71.zip
ieee1394: speed up of dma_region_sync_for_cpu
when attempting to find the 'last' part of the dma region continue the search from where we left off, instead of starting the search over. Signed-off-by: Jim Westfall <jwestfall@surrealistic.net> Signed-off-by: Ben Collins <bcollins@ubuntu.com>
Diffstat (limited to 'drivers/ieee1394')
-rw-r--r--drivers/ieee1394/dma.c18
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/ieee1394/dma.c b/drivers/ieee1394/dma.c
index 9fb2769d9abc..ca5167de707d 100644
--- a/drivers/ieee1394/dma.c
+++ b/drivers/ieee1394/dma.c
@@ -145,12 +145,12 @@ void dma_region_free(struct dma_region *dma)
/* find the scatterlist index and remaining offset corresponding to a
given offset from the beginning of the buffer */
static inline int dma_region_find(struct dma_region *dma, unsigned long offset,
- unsigned long *rem)
+ unsigned int start, unsigned long *rem)
{
int i;
unsigned long off = offset;
- for (i = 0; i < dma->n_dma_pages; i++) {
+ for (i = start; i < dma->n_dma_pages; i++) {
if (off < sg_dma_len(&dma->sglist[i])) {
*rem = off;
break;
@@ -170,7 +170,7 @@ dma_addr_t dma_region_offset_to_bus(struct dma_region * dma,
unsigned long rem = 0;
struct scatterlist *sg =
- &dma->sglist[dma_region_find(dma, offset, &rem)];
+ &dma->sglist[dma_region_find(dma, offset, 0, &rem)];
return sg_dma_address(sg) + rem;
}
@@ -178,13 +178,13 @@ void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset,
unsigned long len)
{
int first, last;
- unsigned long rem;
+ unsigned long rem = 0;
if (!len)
len = 1;
- first = dma_region_find(dma, offset, &rem);
- last = dma_region_find(dma, offset + len - 1, &rem);
+ first = dma_region_find(dma, offset, 0, &rem);
+ last = dma_region_find(dma, rem + len - 1, first, &rem);
pci_dma_sync_sg_for_cpu(dma->dev, &dma->sglist[first], last - first + 1,
dma->direction);
@@ -194,13 +194,13 @@ void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset,
unsigned long len)
{
int first, last;
- unsigned long rem;
+ unsigned long rem = 0;
if (!len)
len = 1;
- first = dma_region_find(dma, offset, &rem);
- last = dma_region_find(dma, offset + len - 1, &rem);
+ first = dma_region_find(dma, offset, 0, &rem);
+ last = dma_region_find(dma, rem + len - 1, first, &rem);
pci_dma_sync_sg_for_device(dma->dev, &dma->sglist[first],
last - first + 1, dma->direction);