[Intel-gfx] [PATCH] igt: Correct the return value for drm short_buffer read

[Chris Wilson]

On Tue, Dec 23, 2014 at 10:14:15AM +0000, Zhang, Xiong Y wrote:
> > -----Original Message-----
> > From: Chris Wilson [mailto:chris at chris-wilson.co.uk]
> > Sent: Tuesday, December 23, 2014 5:53 PM
> > To: Zhang, Xiong Y
> > Cc: intel-gfx at lists.freedesktop.org
> > Subject: Re: [Intel-gfx] [PATCH] igt: Correct the return value for drm
> > short_buffer read
> > 
> > On Tue, Dec 23, 2014 at 03:52:11PM +0800, Xiong Zhang wrote:
> > > After i915 commit:
> > > commit bd008e5b2953186fc0c6633a885ade95e7043800
> > > Author: Chris Wilson <chris at chris-wilson.co.uk>
> > > Date:   Tue Oct 7 14:13:51 2014 +0100
> > >
> > >     drm: Implement O_NONBLOCK support on /dev/dri/cardN
> > >
> > > the return value for drm short_buffer read is -1 and errno is EAGAIN.
> > 
> > No, it is not.
> > -Chris
> Without this patch, system fail in short-buffer-block and short-buffer-nonblock subtest.
> With this patch, these two subtest could pass.

That's the point of the test, the kernel behaviour is wrong. There is a
patch to fix the kernel.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre