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async_tx: avoid the async xor_zero_sum path when src_cnt > device->max_xor

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If the channel cannot perform the operation in one call to
->device_prep_dma_zero_sum, then fallback to the xor+page_is_zero path.
This only affects users with arrays larger than 16 devices on iop13xx or
32 devices on iop3xx.

Cc: <stable@kernel.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2008-03-18 21:23:59 -07:00
parent f79abb627f
commit 8d8002f642
1 changed files with 1 additions and 1 deletions
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2
crypto/async_tx/async_xor.c
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@ -271,7 +271,7 @@ async_xor_zero_sum(struct page *dest, struct page **src_list,
BUG_ON(src_cnt <= 1);
if (device) {
if (device && src_cnt <= device->max_xor) {
dma_addr_t *dma_src = (dma_addr_t *) src_list;
unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0;
int i;