RE: [PATCH 22/29] net_dma: poll for a descriptor after allocation failure

Williams, Dan J wrote:

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: Dan Williams <redacted>
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Signed-off-by: Maciej Sosnowski <redacted>