[Intel-gfx] [PATCH 38/49] drm/i915: Skip allocating shadow batch for 0-length batches

[Chris Wilson]

On Fri, Mar 27, 2015 at 11:02:10AM +0000, Chris Wilson wrote:
> Since
> 
> commit 17cabf571e50677d980e9ab2a43c5f11213003ae
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Wed Jan 14 11:20:57 2015 +0000
> 
>     drm/i915: Trim the command parser allocations
> 
> we may then try to allocate a zero-sized object and attempt to extract
> its pages. Understandably this fails.

The original failure was in

committ b9ffd80ed659c559152c042e74741f4f60cac691
Author: Brad Volkin <bradley.d.volkin at intel.com>
Date:   Thu Dec 11 12:13:10 2014 -0800

    drm/i915: Use batch length instead of object size in command parser

merged in the v4.0 cycle.

Jani, pretty please?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre