Re: [PATCH v2 2/6] soc: hisilicon: kunpeng_hccs: Return failure on having not die or port information

[Jonathan Cameron <Jonathan.Cameron@Huawei.com>]

On Fri, 23 Aug 2024 11:10:55 +0800
Huisong Li <lihuisong@huawei.com> wrote:

> Driver is unavailable if all die number or all port number obtained from
> firmware are zero. So return failure in this case.

Perhaps should include a little info on whether there are firmware's out
there that do this or not?  I.e. Fix, or hardening?

> 
> Signed-off-by: Huisong Li <lihuisong@huawei.com>
Otherwise, this lgtm.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

> ---
>  drivers/soc/hisilicon/kunpeng_hccs.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/soc/hisilicon/kunpeng_hccs.c b/drivers/soc/hisilicon/kunpeng_hccs.c
> index c4a57328f22a..6e88f597f267 100644
> --- a/drivers/soc/hisilicon/kunpeng_hccs.c
> +++ b/drivers/soc/hisilicon/kunpeng_hccs.c
> @@ -451,6 +451,7 @@ static int hccs_query_all_die_info_on_platform(struct hccs_dev *hdev)
>  	struct device *dev = hdev->dev;
>  	struct hccs_chip_info *chip;
>  	struct hccs_die_info *die;
> +	bool has_die_info = false;
>  	u8 i, j;
>  	int ret;
>  
> @@ -459,6 +460,7 @@ static int hccs_query_all_die_info_on_platform(struct hccs_dev *hdev)
>  		if (!chip->die_num)
>  			continue;
>  
> +		has_die_info = true;
>  		chip->dies = devm_kzalloc(hdev->dev,
>  				chip->die_num * sizeof(struct hccs_die_info),
>  				GFP_KERNEL);
> @@ -480,7 +482,7 @@ static int hccs_query_all_die_info_on_platform(struct hccs_dev *hdev)
>  		}
>  	}
>  
> -	return 0;
> +	return has_die_info ? 0 : -EINVAL;
>  }
>  
>  static int hccs_get_bd_info(struct hccs_dev *hdev, u8 opcode,
> @@ -601,6 +603,7 @@ static int hccs_query_all_port_info_on_platform(struct hccs_dev *hdev)
>  	struct device *dev = hdev->dev;
>  	struct hccs_chip_info *chip;
>  	struct hccs_die_info *die;
> +	bool has_port_info = false;
>  	u8 i, j;
>  	int ret;
>  
> @@ -611,6 +614,7 @@ static int hccs_query_all_port_info_on_platform(struct hccs_dev *hdev)
>  			if (!die->port_num)
>  				continue;
>  
> +			has_port_info = true;
>  			die->ports = devm_kzalloc(dev,
>  				die->port_num * sizeof(struct hccs_port_info),
>  				GFP_KERNEL);
> @@ -629,7 +633,7 @@ static int hccs_query_all_port_info_on_platform(struct hccs_dev *hdev)
>  		}
>  	}
>  
> -	return 0;
> +	return has_port_info ? 0 : -EINVAL;
>  }
>  
>  static int hccs_get_hw_info(struct hccs_dev *hdev)