linux-kernel - Re: [PATCH 1/2] fpga: dfl: add driver

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Date:   Tue, 20 Oct 2020 07:13:31 -0700
From:   Tom Rix <trix@...hat.com>
To:     Xu Yilun <yilun.xu@...el.com>
Cc:     mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
        lgoncalv@...hat.com, hao.wu@...el.com
Subject: Re: [PATCH 1/2] fpga: dfl: add driver_override support


On 10/20/20 12:11 AM, Xu Yilun wrote:
>>>>>  int __dfl_driver_register(struct dfl_driver *dfl_drv, struct module *owner)
>>>>>  {
>>>>> -	if (!dfl_drv || !dfl_drv->probe || !dfl_drv->id_table)
>>>>> +	if (!dfl_drv || !dfl_drv->probe)
>>>> id_table is still needed for the normal case.
>>>>
>>>> Instead of removing this check, could you add something like
>>>>
>>>> || (!dfl_drv->is_override && !dfl_drv->id_table)
>>> I don't think it is needed. Seems is_override and !id_table are duplicated
>>> conditions for this implementation. And it may make confusing, e.g. could
>>> a driver been force matched when is_override is not set?
>>>
>>> I think we could make it simple, if the dfl driver didn't provide the
>>> id_table, normally it could not match any device. I think it could be
>>> easily understood by dfl driver developers.
>>>
>> Then an ASSERT should be added in dfl_bus_match() for id_entry.
> I didn't get your idea. What Assertion should be added for id_entry?
> BUG_ON(id_entry == NULL)? Then dfl-uio-pdev can't be inserted before
> driver_override is set.
>
> I think it is normal case that a driver is successfully registered but
> doesn't match any device because it provides no id_table.

Ok, i see your point.

Thanks for the explanation.

Tom


>
> Thanks,
> Yilun.
>