diff options
| author | Ben Collins <bcollins@ubuntu.com> | 2006-06-12 23:52:59 +0200 |
|---|---|---|
| committer | Ben Collins <bcollins@ubuntu.com> | 2006-06-12 23:52:59 +0200 |
| commit | 9bb2bcdb4b6f9a04363c8ea4cf72c592d6c7af71 (patch) | |
| tree | 5821a1f75856b45997856f19c0760a932d9709d0 /drivers/ieee1394/dma.c | |
| parent | video1394: be quiet (diff) | |
| download | linux-9bb2bcdb4b6f9a04363c8ea4cf72c592d6c7af71.tar.xz linux-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/dma.c')
| -rw-r--r-- | drivers/ieee1394/dma.c | 18 |
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); |