linux-kernel - Re: [PATCH] lightnvm: fix bio submission issue

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Date:	Sat, 12 Dec 2015 20:08:15 +0100
From:	Matias <mb@...htnvm.io>
To:	Wenwei Tao <ww.tao0320@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH] lightnvm: fix bio submission issue

On 12/09/2015 02:26 PM, Wenwei Tao wrote:
> put bio when submission fails, since we get it
> before submission. And return error when backend
> device driver doesn't provide a submit_io method,
> thus we can end IO properly.
>
> Signed-off-by: Wenwei Tao <ww.tao0320@...il.com>
> ---
>   drivers/lightnvm/gennvm.c | 2 +-
>   drivers/lightnvm/rrpc.c   | 4 +++-
>   2 files changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
> index 35dde84..c8e53c5 100644
> --- a/drivers/lightnvm/gennvm.c
> +++ b/drivers/lightnvm/gennvm.c
> @@ -343,7 +343,7 @@ static void gennvm_generic_to_addr_mode(struct nvm_dev *dev, struct nvm_rq *rqd)
>   static int gennvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
>   {
>   	if (!dev->ops->submit_io)
> -		return 0;
> +		return -ENODEV;
>
>   	/* Convert address space */
>   	gennvm_generic_to_addr_mode(dev, rqd);
> diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
> index 75e59c3..77b066f 100644
> --- a/drivers/lightnvm/rrpc.c
> +++ b/drivers/lightnvm/rrpc.c
> @@ -636,11 +636,12 @@ static int rrpc_end_io(struct nvm_rq *rqd, int error)
>   	if (bio_data_dir(rqd->bio) == WRITE)
>   		rrpc_end_io_write(rrpc, rrqd, laddr, npages);
>
> +	bio_put(rqd->bio);
> +
>   	if (rrqd->flags & NVM_IOTYPE_GC)
>   		return 0;
>
>   	rrpc_unlock_rq(rrpc, rqd);
> -	bio_put(rqd->bio);
>
>   	if (npages > 1)
>   		nvm_dev_dma_free(rrpc->dev, rqd->ppa_list, rqd->dma_ppa_list);
> @@ -827,6 +828,7 @@ static int rrpc_submit_io(struct rrpc *rrpc, struct bio *bio,
>   	err = nvm_submit_io(rrpc->dev, rqd);
>   	if (err) {
>   		pr_err("rrpc: I/O submission failed: %d\n", err);
> +		bio_put(bio);
>   		return NVM_IO_ERR;
>   	}
>
>
Thanks Tao, applied :)
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