> When enqueuing a descriptor, when checking that there is at least one
> slot free for the current descriptor and a later batch descriptor, we
> need to test for both two free and one free, in case the last write
> was a batch descriptor which is allowed to use the "spare" slot.
>
> Similarly, when computing the free space in the ring to return to the
> user, we need to take account of the same condition, so that we do not
> return a "-1" ring space value, by blindly subtracting "2".
>
> Fixes: 245efe544d8e ("raw/ioat: report status of completed jobs")
>
> Reported-by: Jiayu Hu <jiayu...@intel.com>
> Signed-off-by: Bruce Richardson <bruce.richard...@intel.com>
> ---
<...>
Acked-by: Kevin Laatz <kevin.la...@intel.com>
