drm/i915: Skip allocating shadow batch for 0-length batches
authorChris Wilson <chris@chris-wilson.co.uk>
Fri, 27 Mar 2015 11:02:10 +0000 (11:02 +0000)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Fri, 27 Mar 2015 14:28:41 +0000 (15:28 +0100)
commit743e78c1d726d875b98ff9689cc77c4d3d5d9ae2
treefbac8e4b446b06e67d78cf06c9eb89dd2d068469
parent9d918c157fc27716ca8d601745b4776a3145cc93
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>
drivers/gpu/drm/i915/i915_gem_execbuffer.c