[PATCH v2 5/5] nvme: raise FDP placement handle cap to U8_MAX and warn on overflow

[Kanchan Joshi]

On 7/31/2026 8:50 AM, Guixin Liu wrote:
> @@ -2342,7 +2350,7 @@ static int nvme_query_fdp_info(struct nvme_ns *ns, struct nvme_ns_info *info)
>   	if (!info->runs)
>   		return ret;
>   
> -	size = struct_size(ruhs, ruhsd, S8_MAX - 1);
> +	size = struct_size(ruhs, ruhsd, NVME_MAX_PLIDS);
>   	ruhs = kzalloc(size, GFP_KERNEL);
>   	if (!ruhs)
>   		return -ENOMEM;
> @@ -2357,8 +2365,13 @@ static int nvme_query_fdp_info(struct nvme_ns *ns, struct nvme_ns_info *info)
>   		goto free;
>   	}
>   
> -	head->nr_plids = le16_to_cpu(ruhs->nruhsd);
> -	head->nr_plids = min_t(u16, head->nr_plids, S8_MAX - 1);
> +	nr_plids = le16_to_cpu(ruhs->nruhsd);
> +	if (nr_plids > NVME_MAX_PLIDS)

I'd move this check down; after if (!head->nr_plids) part below.

> +		dev_warn(ctrl->device,
> +			 "FDP RUH status reports %u placement handles, capping at %u\n",
> +			 nr_plids, NVME_MAX_PLIDS);
> +
> +	head->nr_plids = min_t(u16, nr_plids, NVME_MAX_PLIDS);

And will keep this in above if block, alongside dev_warn(). And kill 
that min_t with a simple
	head->nr_plids = NVME_MAX_PLIDS;

>   	if (!head->nr_plids)
>   		goto free;
>   

Modulo these nits
Reviewed-by: Kanchan Joshi <joshi.k at samsung.com>