linux-kernel - Re: [PATCH] lightnvm: move the pages per block check out of the loop

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Message-ID: <568BAD1D.3090306@lightnvm.io>
Date:	Tue, 5 Jan 2016 12:46:37 +0100
From:	Matias Bjørling <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: move the pages per block check out of the loop

On 01/05/2016 12:43 PM, Wenwei Tao wrote:
> There is no need to check whether dev's pages per block is
> beyond rrpc support everytime we init a lun, we only need
> to check it once before enter the lun init loop.
>
> Signed-off-by: Wenwei Tao <ww.tao0320@...il.com>
> ---
>   drivers/lightnvm/rrpc.c | 11 +++++------
>   1 file changed, 5 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
> index 27fb98d..286a038 100644
> --- a/drivers/lightnvm/rrpc.c
> +++ b/drivers/lightnvm/rrpc.c
> @@ -1087,6 +1087,11 @@ static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
>   	struct rrpc_lun *rlun;
>   	int i, j;
>
> +	if (dev->pgs_per_blk > MAX_INVALID_PAGES_STORAGE * BITS_PER_LONG) {
> +		pr_err("rrpc: number of pages per block too high.");
> +		return -EINVAL;
> +	}
> +
>   	spin_lock_init(&rrpc->rev_lock);
>
>   	rrpc->luns = kcalloc(rrpc->nr_luns, sizeof(struct rrpc_lun),
> @@ -1098,12 +1103,6 @@ static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
>   	for (i = 0; i < rrpc->nr_luns; i++) {
>   		struct nvm_lun *lun = dev->mt->get_lun(dev, lun_begin + i);
>
> -		if (dev->pgs_per_blk >
> -				MAX_INVALID_PAGES_STORAGE * BITS_PER_LONG) {
> -			pr_err("rrpc: number of pages per block too high.");
> -			goto err;
> -		}
> -
>   		rlun = &rrpc->luns[i];
>   		rlun->rrpc = rrpc;
>   		rlun->parent = lun;
>

Thanks. Leftover from when luns could have different number of pages. 
Applied for 4.5.
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