https://github.com/torvalds/linux
Revision ee73c61c0af590ff2c03fb83e68a5664bd8b38d0 authored by Chris Wilson on 27 March 2015, 11:02:10 UTC, committed by Daniel Vetter on 30 March 2015, 14:59:47 UTC
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.

Note that the real offender seems to be

commit b9ffd80ed659c559152c042e74741f4f60cac691
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: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
[cherry picked from commit 743e78c1d726d875b98ff9689cc77c4d3d5d9ae2
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: Daniel Vetter <daniel.vetter@intel.com>
1 parent e42391c
History
Tip revision: ee73c61c0af590ff2c03fb83e68a5664bd8b38d0 authored by Chris Wilson on 27 March 2015, 11:02:10 UTC
drm/i915: Skip allocating shadow batch for 0-length batches
Tip revision: ee73c61
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