linux-kernel - Re: [PATCH v2 2/5] lightnvm: check for max sector

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Date:	Tue, 24 Nov 2015 12:00:38 +0100
From:	Matias Bjørling <mb@...htnvm.io>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/5] lightnvm: check for max sector

On 11/24/2015 11:34 AM, Sudip Mukherjee wrote:
> If max_phys_sect is greater than 256 then its obviously greater than 1
> so we will never hit the else-if block. And moreover, if we check for
> max_phys_sect at the end then it might happen that we initialize
> successfully only to see at the end that this is not supported.
> Lets check for max_phys_sect at the beginning and continue
> initialization only if it is supported.
>
> Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> ---
>   drivers/lightnvm/core.c | 8 +++++---
>   1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
> index e338048..2ab561f 100644
> --- a/drivers/lightnvm/core.c
> +++ b/drivers/lightnvm/core.c
> @@ -296,6 +296,11 @@ int nvm_register(struct request_queue *q, char *disk_name,
>   	if (!ops->identity)
>   		return -EINVAL;
>
> +	if (ops->max_phys_sect > 256) {
> +		pr_info("nvm: max sectors supported is 256.\n");
> +		return -EINVAL;
> +	}
> +
>   	dev = kzalloc(sizeof(struct nvm_dev), GFP_KERNEL);
>   	if (!dev)
>   		return -ENOMEM;
> @@ -319,9 +324,6 @@ int nvm_register(struct request_queue *q, char *disk_name,
>   			pr_err("nvm: could not create ppa pool\n");
>   			return -ENOMEM;
>   		}
> -	} else if (dev->ops->max_phys_sect > 256) {
> -		pr_info("nvm: max sectors supported is 256.\n");
> -		return -EINVAL;
>   	}
>
>   	return 0;
>
Thanks. Wenwei Tao already sent a fix for this.

You can see the latest patches queued for upstream at:

   https://github.com/OpenChannelSSD/linux/commits/for-next

(remember to switch to the for-next branch in the qemu-nvme repo if 
you're testing with qemu).
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