[PATCH] drm/syncobj: return meaningful value to user space

[Chunming Zhou]

在 2019/7/18 21:15, Zhou, David(ChunMing) 写道:
> 在 2019/7/18 21:10, Chris Wilson 写道:
>> Quoting Chunming Zhou (2019-07-18 14:04:09)
>>> 在 2019/7/18 19:18, Chris Wilson 写道:
>>>> Quoting Chunming Zhou (2019-07-18 12:13:39)
>>>>> if WAIT_FOR_SUBMIT isn't set and in the meanwhile no underlying fence on syncobj,
>>>>> then return non-block error code to user sapce.
>>>> Block device required?
>>> Yes, if WAIT_FOR_SUBMIT is set, then that will block device.
>> No, the error message is that it requires a "block device", not that it
>> will block the device, which is EWOULDBLOCK.

Ah, I think I don't want EWOULDBLOCK, which will try again and again 
ioctl, that is not my movitation.

I just need a meaningful value to identify the underlying fence isn't 
ready on syncobj.

Because it is in 'else' case, ENOTBLK is correct to say here need block 
but WAIT_FOR_SUBMIT isn't set.


-David

> OK, I got your mean.
>
> Any other possile value suggestted?
>
> -David
>
>> -Chris