[PATCH] dma/idxd: fix burst capacity calculation

[Kevin Laatz]

On 20/12/2021 17:05, Bruce Richardson wrote:
> When the maximum burst size supported by HW is less than the available
> ring space, incorrect capacity was returned when there was already some
> jobs queued up for submission. This was because the capacity calculation
> failed to subtract the number of already-enqueued jobs from the max
> burst size. After subtraction is done, ensure that any negative values
> (which should never occur if the user respects the reported limits), are
> clamped to zero.
>
> Fixes: 9459de4edc99 ("dma/idxd: add burst capacity")
> Cc: kevin.laatz at intel.com
> Cc: stable at dpdk.org
>
> Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
> ---
>   drivers/dma/idxd/idxd_common.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
Acked-by: Kevin Laatz <kevin.laatz at intel.com>