Re: [PATCH v16 06/11] fw_cfg: handle fw_cfg_read_blob() error

Marc-André Lureau
2018-03-01T11:36:36Z

Hi

On Wed, Feb 28, 2018 at 6:32 PM, Michael S. Tsirkin <mst@redhat.com> wrote:
>> @@ -557,7 +566,10 @@ static int fw_cfg_sysfs_probe(struct platform_device *pdev)
>> goto err_probe;
>>
>> /* get revision number, add matching top-level attribute */
>> - fw_cfg_read_blob(FW_CFG_ID, &rev, 0, sizeof(rev));
>> + err = fw_cfg_read_blob(FW_CFG_ID, &rev, 0, sizeof(rev));
>> + if (err < 0)
>> + goto err_probe;
>> +
>> fw_cfg_rev = le32_to_cpu(rev);
>> err = sysfs_create_file(fw_cfg_top_ko, &fw_cfg_rev_attr.attr);
>> if (err)
>
> So on this one, maybe we should just drop this attribute.
> Does anyone use it?
> Removing it will speed up boot slightly.

We can't skip reading FW_CFG_ID (rev) as we need it to check DMA
support. I don't mind if we remove the sysfs entry, but I doubt it
makes a difference in boot time.

>> --
>> 2.16.1.73.g5832b7e9f2