4.14-stable review patch.  If anyone has any objections, please let me know.


From: Chris Wilson <ch...@chris-wilson.co.uk>

commit e659d14ed48096f87a678e7ebbdf286a817b4d0e upstream.

If we fail to unbind the vma (due to a signal on an active buffer that
needs to be moved for the next execbuf), then we need to clear the
persistent tracking state we setup for this execbuf.

Fixes: c7c6e46f913b ("drm/i915: Convert execbuf to use struct-of-array packing 
for critical fields")
Testcase: igt/gem_fenced_exec_thrash/no-spare-fences-busy*
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
Cc: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
Cc: <sta...@vger.kernel.org> # v4.14+
Reviewed-by: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
(cherry picked from commit ed2f3532321083cf40e4da4e36234880e0136136)
Signed-off-by: Rodrigo Vivi <rodrigo.v...@intel.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

 drivers/gpu/drm/i915/i915_gem_execbuffer.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -499,6 +499,8 @@ eb_add_vma(struct i915_execbuffer *eb, u
                list_add_tail(&vma->exec_link, &eb->unbound);
                if (drm_mm_node_allocated(&vma->node))
                        err = i915_vma_unbind(vma);
+               if (unlikely(err))
+                       vma->exec_flags = NULL;
        return err;

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