提交 743e78c1 编写于 作者: C Chris Wilson 提交者: Daniel Vetter

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.

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>
上级 9d918c15
......@@ -1547,7 +1547,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
goto err;
}
if (i915_needs_cmd_parser(ring)) {
if (i915_needs_cmd_parser(ring) && args->batch_len) {
batch_obj = i915_gem_execbuffer_parse(ring,
&shadow_exec_entry,
eb,
......
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