tree a7747543a2076a2f58f423297e0da78b2963a04d
parent a309218acee8606f7e235da20cc826eb06d9b0f6
author Dan Williams <dan.j.williams@intel.com> 1252436535 -0700
committer Dan Williams <dan.j.williams@intel.com> 1252456734 -0700

net_dma: poll for a descriptor after allocation failure

Handle descriptor allocation failures by polling for a descriptor.  The
driver will force forward progress when polled.  In the best case this
polling interval will be the time it takes for one dma memcpy
transaction to complete.  In the worst case, channel hang, we will need
to wait 100ms for the cleanup watchdog to fire (ioatdma driver).

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