RE: [PATCH 1/3] ioat3: fix p-disabled q-continuation

[Sosnowski, Maciej]

Williams, Dan J wrote:
> When continuing a pq calculation the driver needs 3 extra sources.  The
> driver can perform a 3 source calculation with a single descriptor, but
> needs an extended descriptor to process up to 8 sources in one
> operation.  However, in the p-disabled case only one extra source is
> needed.  When continuing a p-disabled operation there are occasions
> (i.e. 0 < src_cnt % 8 < 3) where the tail operation does not need an
> extended descriptor.  Properly account for this fact otherwise invalid
> 'dmacount' values will be written to hardware usually causing the
> channel to halt with 'invalid descriptor' errors.
> 
> Cc: <stable@xxxxxxxxxx>
> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
> ---

Acked-by: Maciej Sosnowski <maciej.sosnowski@xxxxxxxxx>
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