linux-kernel - Re: [PATCH] lightnvm: do not load L2P table if not supported

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Date:	Wed, 2 Mar 2016 19:53:55 +0100
From:	Matias Bjørling <mb@...htnvm.io>
To:	Javier González <jg@...htnvm.io>
Cc:	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
	Javier González <javier@...xlabs.com>
Subject: Re: [PATCH] lightnvm: do not load L2P table if not supported

On 03/02/2016 04:21 PM, Javier González wrote:
> An Open-Channel SSD can work on two modes: (i) hybrid mode, where the
> L2P table is maintained both by the host and by the device; and (ii)
> full host-based, where the L2P table is uniquely maintained by the host.
> The current rrpc target operates on hybrid mode.
>
> In the advent of a new target implementing the full host-based mode, do
> not assume that the L2P table must be loaded on the generic media
> manager; check device properties loaded on the identify command instead.
>
> Signed-off-by: Javier González <javier@...xlabs.com>
> ---
>   drivers/lightnvm/gennvm.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
> index 42c1c2a..0625d42 100644
> --- a/drivers/lightnvm/gennvm.c
> +++ b/drivers/lightnvm/gennvm.c
> @@ -257,6 +257,9 @@ static int gennvm_blocks_init(struct nvm_dev *dev, struct gen_nvm *gn)
>   		}
>   	}
>
> +	if (!(dev->identity.dom & NVM_RSP_L2P))
> +		return 0;
> +
>   	if (dev->ops->get_l2p_tbl) {
>   		ret = dev->ops->get_l2p_tbl(dev, 0, dev->total_secs,
>   							gennvm_block_map, dev);
>

Thanks, applied for 4.6.