linux-kernel - Re: [PATCH v2 1/2] RDMA/hfi1: Fix error return code in parse_platform

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Date:   Sat, 26 Nov 2022 14:04:06 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Wang Yufen <wangyufen@...wei.com>
Cc:     bvanassche@....org, jgg@...pe.ca, leon@...nel.org,
        dennis.dalessandro@...nelisnetworks.com,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        bart.vanassche@....com, easwar.hariharan@...el.com
Subject: Re: [PATCH v2 1/2] RDMA/hfi1: Fix error return code in
 parse_platform_config()

On Sat, Nov 26, 2022 at 11:35:03AM +0800, Wang Yufen wrote:
> In the previous while loop, "ret" may be assigned zero, so the error
> return code may be incorrectly set to 0 instead of -EINVAL.
> Add bail_with_einval goto label and covert all "goto bail;" to "goto
> bail_with_einval:" where it's appropriate. Add dropping some duplicative
> "ret = -EINVAL;" lines, as Andy suggessted.

This one looks good to me, FWIW,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> Fixes: 97167e813415 ("staging/rdma/hfi1: Tune for unknown channel if configuration file is absent")
> Signed-off-by: Wang Yufen <wangyufen@...wei.com>
> ---
>  drivers/infiniband/hw/hfi1/firmware.c | 20 +++++++++++---------
>  1 file changed, 11 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/hfi1/firmware.c b/drivers/infiniband/hw/hfi1/firmware.c
> index 1d77514..44d8628 100644
> --- a/drivers/infiniband/hw/hfi1/firmware.c
> +++ b/drivers/infiniband/hw/hfi1/firmware.c
> @@ -1730,7 +1730,7 @@ int parse_platform_config(struct hfi1_devdata *dd)
>  	u32 *ptr = NULL;
>  	u32 header1 = 0, header2 = 0, magic_num = 0, crc = 0, file_length = 0;
>  	u32 record_idx = 0, table_type = 0, table_length_dwords = 0;
> -	int ret = -EINVAL; /* assume failure */
> +	int ret;
>  
>  	/*
>  	 * For integrated devices that did not fall back to the default file,
> @@ -1743,7 +1743,7 @@ int parse_platform_config(struct hfi1_devdata *dd)
>  
>  	if (!dd->platform_config.data) {
>  		dd_dev_err(dd, "%s: Missing config file\n", __func__);
> -		goto bail;
> +		goto bail_with_einval;
>  	}
>  	ptr = (u32 *)dd->platform_config.data;
>  
> @@ -1751,7 +1751,7 @@ int parse_platform_config(struct hfi1_devdata *dd)
>  	ptr++;
>  	if (magic_num != PLATFORM_CONFIG_MAGIC_NUM) {
>  		dd_dev_err(dd, "%s: Bad config file\n", __func__);
> -		goto bail;
> +		goto bail_with_einval;
>  	}
>  
>  	/* Field is file size in DWORDs */
> @@ -1774,7 +1774,7 @@ int parse_platform_config(struct hfi1_devdata *dd)
>  	if (file_length > dd->platform_config.size) {
>  		dd_dev_info(dd, "%s:File claims to be larger than read size\n",
>  			    __func__);
> -		goto bail;
> +		goto bail_with_einval;
>  	} else if (file_length < dd->platform_config.size) {
>  		dd_dev_info(dd,
>  			    "%s:File claims to be smaller than read size, continuing\n",
> @@ -1794,7 +1794,7 @@ int parse_platform_config(struct hfi1_devdata *dd)
>  			dd_dev_err(dd, "%s: Failed validation at offset %ld\n",
>  				   __func__, (ptr - (u32 *)
>  					      dd->platform_config.data));
> -			goto bail;
> +			goto bail_with_einval;
>  		}
>  
>  		record_idx = *ptr &
> @@ -1837,7 +1837,7 @@ int parse_platform_config(struct hfi1_devdata *dd)
>  					   __func__, table_type,
>  					   (ptr - (u32 *)
>  					    dd->platform_config.data));
> -				goto bail; /* We don't trust this file now */
> +				goto bail_with_einval; /* We don't trust this file now */
>  			}
>  			pcfgcache->config_tables[table_type].table = ptr;
>  		} else {
> @@ -1856,7 +1856,7 @@ int parse_platform_config(struct hfi1_devdata *dd)
>  					   __func__, table_type,
>  					   (ptr -
>  					    (u32 *)dd->platform_config.data));
> -				goto bail; /* We don't trust this file now */
> +				goto bail_with_einval; /* We don't trust this file now */
>  			}
>  			pcfgcache->config_tables[table_type].table_metadata =
>  									ptr;
> @@ -1873,8 +1873,7 @@ int parse_platform_config(struct hfi1_devdata *dd)
>  			dd_dev_err(dd, "%s: Failed CRC check at offset %ld\n",
>  				   __func__, (ptr -
>  				   (u32 *)dd->platform_config.data));
> -			ret = -EINVAL;
> -			goto bail;
> +			goto bail_with_einval;
>  		}
>  		/* Jump the CRC DWORD */
>  		ptr++;
> @@ -1882,6 +1881,9 @@ int parse_platform_config(struct hfi1_devdata *dd)
>  
>  	pcfgcache->cache_valid = 1;
>  	return 0;
> +
> +bail_with_einval:
> +	ret = -EINVAL;
>  bail:
>  	memset(pcfgcache, 0, sizeof(struct platform_config_cache));
>  	return ret;
> -- 
> 1.8.3.1
> 

-- 
With Best Regards,
Andy Shevchenko