tree fbac8e4b446b06e67d78cf06c9eb89dd2d068469
parent 9d918c157fc27716ca8d601745b4776a3145cc93
author Chris Wilson <chris@chris-wilson.co.uk> 1427454130 +0000
committer Daniel Vetter <daniel.vetter@ffwll.ch> 1427466521 +0100

drm/i915: Skip allocating shadow batch for 0-length batches

Since

commit 17cabf571e50677d980e9ab2a43c5f11213003ae
Author: Chris Wilson <chris@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.

Testcase: igt/gem_exec_nop #ivb,byt,hsw
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>