Re: [dm-devel] [PATCH v2 3/4] nvme: introduce FAILUP handling for REQ_FAILFAST_TRANSPORT

["Ewan D. Milne" <emilne@xxxxxxxxxx>]

On Fri, 2021-04-16 at 16:07 +0200, Hannes Reinecke wrote:
> 
> Hmm. Quite convoluted, methinks.
> Shouldn't this achieve the same thing?
> 
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index e89ec2522ca6..8c36a2196b66 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -303,8 +303,10 @@ static inline enum nvme_disposition
> nvme_decide_disposition(struct request *req)
>         if (likely(nvme_req(req)->status == 0))
>                 return COMPLETE;
> 
> -       if (blk_noretry_request(req) ||
> -           (nvme_req(req)->status & NVME_SC_DNR) ||
> +       if (blk_noretry_request(req))
> +               nvme_req(req)->status |= NVME_SC_DNR;
> +
> +       if ((nvme_req(req)->status & NVME_SC_DNR) ||
>             nvme_req(req)->retries >= nvme_max_retries)
>                 return COMPLETE;
> 

I am not in favor of altering ->status to set DNR jus to
simplify the following conditional.

-Ewan