[PATCH 06/12] nvme: switch abort to blk_execute_rq_nowait

[Keith Busch]

On Sat, Nov 07, 2015 at 09:45:00AM +0100, Christoph Hellwig wrote:
> And remove the new unused nvme_submit_cmd helper.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>
> ---
>  drivers/nvme/host/core.c |  8 +++---
>  drivers/nvme/host/nvme.h |  2 +-
>  drivers/nvme/host/pci.c  | 66 ++++++++++++++++++++----------------------------
>  3 files changed, 32 insertions(+), 44 deletions(-)
> 
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index 37f7d69..3600a0c 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -86,12 +86,12 @@ void nvme_requeue_req(struct request *req)
>  }
>  
>  struct request *nvme_alloc_request(struct request_queue *q,
> -		struct nvme_command *cmd)
> +		struct nvme_command *cmd, bool nowait)
>  {
>  	bool write = cmd->common.opcode & 1;
>  	struct request *req;
>  
> -	req = blk_mq_alloc_request(q, write, GFP_KERNEL, false);
> +	req = blk_mq_alloc_request(q, write, GFP_KERNEL, nowait);

The "nowait" flag tells blk_mq_alloc_request to allocate out of the
reserved tags, but we've reserved only one of these for AEN requests.
Your next patch changes the AEN notification a bit, but this will still
create a command id conflict for the controller.