+ Luis (again) ;-)
On 29-07-16 08:13, Daniel Wagner wrote:
> On 07/28/2016 09:01 PM, Bjorn Andersson wrote:
>> On Thu 28 Jul 11:33 PDT 2016, Dmitry Torokhov wrote:
>>
>>> On Thu, Jul 28, 2016 at 09:55:11AM +0200, Daniel Wagner wrote:
>>>> From: Daniel Wagner <daniel.wagner@xxxxxxxxxxxx>
>>>>
>> [..]
>>>
>>> Do not quite like it... I'd rather asynchronous request give out a
>>> firmware status pointer that could be used later on.
Excellent. Why not get rid of the callback function as well and have
fw_loading_wait() return result (0 = firmware available, < 0 = fail).
Just to confirm, you are proposing a new API function next to
request_firmware_nowait(), right?
>>> pcu->fw_st = request_firmware_async(IMS_PCU_FIRMWARE_NAME,
>>> - pcu,
>>> - ims_pcu_process_async_firmware);
+ pcu);
>>> if (IS_ERR(pcu->fw_st))
>>> return PTR_ERR(pcu->fw_st);
>>>
>>> ....
>>>
>>> err = fw_loading_wait(pcu->fw_st);
if (err)
return err;
fw = fwstat_get_firmware(pcu->fw_st);
Or whatever consistent prefix it is going to be.
>>>
>>
>> In the remoteproc case (patch 6) this would clean up the code, rather
>> than replacing the completion API 1 to 1. I like it!
>
> IIRC most drivers do it the same way. So request_firmware_async() indeed
> would be good thing to have. Let me try that.
While the idea behind this series is a good one I am wondering about the
need for these drivers to use the asynchronous API. The historic reason
might be to avoid timeout caused by user-mode helper, but that may no
longer apply and these drivers could be better off using
request_firmware_direct().
There have been numerous discussions about the firmware API. Here most
recent one:
http://www.spinics.net/lists/linux-wireless/index.html#152755
Regards,
Arend
> Thanks for the excellent feedback.
>
> cheers,
> daniel
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