[Intel-gfx] [PATCH 2/2] drm/i915: Treat using a purged buffer as a source of EFAULT

[Chris Wilson]

On Tue, Feb 04, 2014 at 12:05:13PM +0100, Daniel Vetter wrote:
> On Fri, Jan 31, 2014 at 11:34:58AM +0000, Chris Wilson wrote:
> > Since a purged buffer is one without any associated pages, attempting to
> > use it should generate EFAULT rather than EINVAL, as it is not strictly
> > an invalid parameter.
> > 
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> 
> Care to drop a quick testcase into i-g-t to encode this return value
> change? Also, any plans to use this with userspace somehow, or what's the
> motivation for this?

Just that we have other paths where inaccessible pages are reported back
to userspace as EFAULT, and this is another case where we could distinguish
the errno and so be more consistent.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre