drm/i915: Skip allocating shadow batch for 0-length batches
Since commit 17cabf57 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. Note that the real offender seems to be commit b9ffd80e Author: Brad Volkin <bradley.d.volkin@intel.com> Date: Thu Dec 11 12:13:10 2014 -0800 drm/i915: Use batch length instead of object size in command parser Testcase: igt/gem_exec_nop #ivb,byt,hsw Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch> [cherry picked from commit 743e78c1 from drm-intel-next because 4.0 seems to be affected by this too, despite that the obvious culprit is definitely not in 4.0. Whatever, if fixes a bug. Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
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