tree 8a2bc28955710c580201046d04843773cb7d87a1
parent 4499a24dec00e037da7d09caccad45e7594a9c19
author Dan Williams <dan.j.williams@intel.com> 1258675837 -0700
committer Dan Williams <dan.j.williams@intel.com> 1258698063 -0700

async_tx: build-time toggling of async_{syndrome,xor}_val dma support

ioat3.2 does not support asynchronous error notifications which makes
the driver experience latencies when non-zero pq validate results are
expected.  Provide a mechanism for turning off async_xor_val and
async_syndrome_val via Kconfig.  This approach is generally useful for
any driver that specifies ASYNC_TX_DISABLE_CHANNEL_SWITCH and would like
to force the async_tx api to fall back to the synchronous path for
certain operations.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>