tree 81a3df533e7a0ad2d268b28fba1507e770df0f55
parent f79abb627f033c85a6088231f20c85bc4a9bd757
author Dan Williams <dan.j.williams@intel.com> 1205900639 -0700
committer Dan Williams <dan.j.williams@intel.com> 1205884860 -0700

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

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>