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async_pq: kill a stray dma_map() call and other cleanups

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- update the kernel doc for async_syndrome to indicate what NULL in the
  source list means
- whitespace fixups

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2009-10-19 18:09:32 -07:00
parent 6629542e79
commit 5676470f06
1 changed files with 8 additions and 7 deletions
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15
crypto/async_tx/async_pq.c
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@ -181,10 +181,14 @@ do_sync_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
* blocks[disks-1] to NULL. When P or Q is omitted 'len' must be <= * blocks[disks-1] to NULL. When P or Q is omitted 'len' must be <=
* PAGE_SIZE as a temporary buffer of this size is used in the * PAGE_SIZE as a temporary buffer of this size is used in the
* synchronous path. 'disks' always accounts for both destination * synchronous path. 'disks' always accounts for both destination
* buffers. * buffers. If any source buffers (blocks[i] where i < disks - 2) are
* set to NULL those buffers will be replaced with the raid6_zero_page
* in the synchronous path and omitted in the hardware-asynchronous
* path.
* *
* 'blocks' note: if submit->scribble is NULL then the contents of * 'blocks' note: if submit->scribble is NULL then the contents of
* 'blocks' may be overridden * 'blocks' may be overwritten to perform address conversions
* (dma_map_page() or page_address()).
*/ */
struct dma_async_tx_descriptor * struct dma_async_tx_descriptor *
async_gen_syndrome(struct page **blocks, unsigned int offset, int disks, async_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
@ -283,13 +287,13 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
if (!P(blocks, disks)) if (!P(blocks, disks))
dma_flags |= DMA_PREP_PQ_DISABLE_P; dma_flags |= DMA_PREP_PQ_DISABLE_P;
else else
pq[0] = dma_map_page(dev, P(blocks,disks), pq[0] = dma_map_page(dev, P(blocks, disks),
offset, len, offset, len,
DMA_TO_DEVICE); DMA_TO_DEVICE);
if (!Q(blocks, disks)) if (!Q(blocks, disks))
dma_flags |= DMA_PREP_PQ_DISABLE_Q; dma_flags |= DMA_PREP_PQ_DISABLE_Q;
else else
pq[1] = dma_map_page(dev, Q(blocks,disks), pq[1] = dma_map_page(dev, Q(blocks, disks),
offset, len, offset, len,
DMA_TO_DEVICE); DMA_TO_DEVICE);
@ -303,9 +307,6 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
coefs[src_cnt] = raid6_gfexp[i]; coefs[src_cnt] = raid6_gfexp[i];
src_cnt++; src_cnt++;
} }
pq[1] = dma_map_page(dev, Q(blocks,disks),
offset, len,
DMA_TO_DEVICE);
for (;;) { for (;;) {
tx = device->device_prep_dma_pq_val(chan, pq, dma_src, tx = device->device_prep_dma_pq_val(chan, pq, dma_src,