[Suspected-Phishing][PATCH 1/1] nvme-rdma: remove redundant reference between ib_device and tagset

[Max Gurtovoy]

please ignore this version.
I'll send V2.

On 1/17/2018 4:43 PM, Max Gurtovoy wrote:
> In the past, before adding f41725bb ("nvme-rdma: Use mr pool") commit,
> we needed a reference on the ib_device as long as the tagset
> was alive, as the MRs in the request structures needed a valid ib_device.
> Now, we allocate/deallocate MR pool per and QP and consume on demand.
> 
> Also remove nvme_rdma_free_tagset function and use blk_mq_free_tag_set
> instead, as it unneeded anymore.
> 
> Signed-off-by: Max Gurtovoy <maxg at mellanox.com>
> ---
>   drivers/nvme/host/rdma.c | 34 +++++-----------------------------
>   1 file changed, 5 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
> index 2a0bba7..5eee1d7 100644
> --- a/drivers/nvme/host/rdma.c
> +++ b/drivers/nvme/host/rdma.c
> @@ -666,15 +666,6 @@ static int nvme_rdma_alloc_io_queues(struct nvme_rdma_ctrl *ctrl)
>   	return ret;
>   }
>   
> -static void nvme_rdma_free_tagset(struct nvme_ctrl *nctrl,
> -		struct blk_mq_tag_set *set)
> -{
> -	struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
> -
> -	blk_mq_free_tag_set(set);
> -	nvme_rdma_dev_put(ctrl->device);
> -}
> -
>   static struct blk_mq_tag_set *nvme_rdma_alloc_tagset(struct nvme_ctrl *nctrl,
>   		bool admin)
>   {
> @@ -712,24 +703,9 @@ static struct blk_mq_tag_set *nvme_rdma_alloc_tagset(struct nvme_ctrl *nctrl,
>   
>   	ret = blk_mq_alloc_tag_set(set);
>   	if (ret)
> -		goto out;
> -
> -	/*
> -	 * We need a reference on the device as long as the tag_set is alive,
> -	 * as the MRs in the request structures need a valid ib_device.
> -	 */
> -	ret = nvme_rdma_dev_get(ctrl->device);
> -	if (!ret) {
> -		ret = -EINVAL;
> -		goto out_free_tagset;
> -	}
> +		return ERR_PTR(ret);
>   
>   	return set;
> -
> -out_free_tagset:
> -	blk_mq_free_tag_set(set);
> -out:
> -	return ERR_PTR(ret);
>   }
>   
>   static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl,
> @@ -738,7 +714,7 @@ static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl,
>   	nvme_rdma_stop_queue(&ctrl->queues[0]);
>   	if (remove) {
>   		blk_cleanup_queue(ctrl->ctrl.admin_q);
> -		nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.admin_tagset);
> +		blk_mq_free_tag_set(ctrl->ctrl.admin_tagset);
>   	}
>   	nvme_rdma_free_queue(&ctrl->queues[0]);
>   }
> @@ -809,7 +785,7 @@ static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl,
>   		blk_cleanup_queue(ctrl->ctrl.admin_q);
>   out_free_tagset:
>   	if (new)
> -		nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.admin_tagset);
> +		blk_mq_free_tag_set(ctrl->ctrl.admin_tagset);
>   out_free_queue:
>   	nvme_rdma_free_queue(&ctrl->queues[0]);
>   	return error;
> @@ -821,7 +797,7 @@ static void nvme_rdma_destroy_io_queues(struct nvme_rdma_ctrl *ctrl,
>   	nvme_rdma_stop_io_queues(ctrl);
>   	if (remove) {
>   		blk_cleanup_queue(ctrl->ctrl.connect_q);
> -		nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.tagset);
> +		blk_mq_free_tag_set(ctrl->ctrl.tagset);
>   	}
>   	nvme_rdma_free_io_queues(ctrl);
>   }
> @@ -862,7 +838,7 @@ static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new)
>   		blk_cleanup_queue(ctrl->ctrl.connect_q);
>   out_free_tag_set:
>   	if (new)
> -		nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.tagset);
> +		blk_mq_free_tag_set(ctrl->ctrl.tagset);
>   out_free_io_queues:
>   	nvme_rdma_free_io_queues(ctrl);
>   	return ret;
>