[PATCH 2/2] nvme: start keep alive timer when enabling the controller

[james.smart@broadcom.com (James Smart)]

On 4/15/2018 1:47 AM, Sagi Grimberg wrote:
> From: Max Gurtuvoy <maxg at mellanox.com>
>
> We start the keep alive timer after all the I/O queues were
> created, this might be too late as the controller might have
> start its keep alive timer when it was enabled. Hence, start
> it right after controller enable was completed.
>
> We stop the keep alive in nvme_stop_ctrl as its before the
> disable/shutdown and its independent of the transport connectivity.
>
> Suggested-by: Max Gurtuvoy <maxg at mellanox.com>
> Suggested-by: James Smart <james.smart at broadcom.com>
> Signed-off-by: Sagi Grimberg <sagi at grimberg.me>
> ---
>   drivers/nvme/host/core.c | 12 ++++++++----
>   1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index e1b708ee6783..4b5c3f7addeb 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -1739,7 +1739,14 @@ int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
>   	ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
>   	if (ret)
>   		return ret;
> -	return nvme_wait_ready(ctrl, cap, true);
> +
> +	ret = nvme_wait_ready(ctrl, cap, true);
> +	if (ret)
> +		return ret;
> +
> +	nvme_start_keep_alive(ctrl);
> +
> +	return 0;
>   }
>   EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
>   
> @@ -3393,9 +3400,6 @@ EXPORT_SYMBOL_GPL(nvme_stop_ctrl);
>   
>   void nvme_start_ctrl(struct nvme_ctrl *ctrl)
>   {
> -	if (ctrl->kato)
> -		nvme_start_keep_alive(ctrl);
> -
>   	if (ctrl->queue_count > 1) {
>   		nvme_queue_scan(ctrl);
>   		queue_work(nvme_wq, &ctrl->async_event_work);


Signed-off-by:? James Smart <james.smart at broadcom.com>