drm/i915: Don't destroy the vma placeholder during execbuffer reservation

The execbuffer handle and exec_link were moved from the object into the
vma. As the vma may be unbound and destroyed whilst attempting to
reserve the execbuffer objects (either through a forced unbind to fix up
a misalignment or through an evict-everything call) we need to prevent
the free of the i915_vma itself. Otherwise not only is the list of
objects to reserve corrupt, but we continue to reference stale vma
entries.

Fixes kernel crash with i-g-t/gem_evict_everything

This regression has been introduced in

commit 04038a515d6eda6dd0857c0ade0b3950d372f4c0
Author:     Ben Widawsky <[email protected]>
AuthorDate: Wed Aug 14 11:38:36 2013 +0200

    drm/i915: Convert execbuf code to use vmas

Reported-by: Dan Carpenter <[email protected]>
References: http://www.spinics.net/lists/intel-gfx/msg32038.html
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=68298
Signed-off-by: Chris Wilson <[email protected]>
Cc: Ben Widawsky <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>

0 files changed, 0 insertions, 0 deletions