drm/i915: Fix use-after-free of context during free_contexts
When iterating the list of contexts to free, we need to use a safe iterator as we are freeing the link as we go. Pass an extra thick brown paper bag. Fixes: 5f09a9c8 ("drm/i915: Allow contexts to be unreferenced locklessly") Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Matthew Auld <matthew.auld@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170630230517.1938-1-chris@chris-wilson.co.ukReviewed-by: NMatthew Auld <matthew.auld@intel.com>
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