Various things can go wrong during initialisation and teardown, but they
usually don't, so the error-handling paths go largely untested. This
collection of patches fixes some things I recently noticed. Some might
lead to a kernel OOPS, but mostly they're leaks and other inconsistencies.
Includes Nick Hoath's patch to swap context/engine teardown, because
that helps make setup & teardown more consistent too.
v2:
Patches reordered and the previous [1/4] split into [4..6/6],
so that the bugs that it's fixing are more clearly visible
(Mika Kuoppala, although he said it wasn't actually *necessary*).
GIT: [PATCH 1/6] drm/i915: fix context/engine cleanup order
GIT: [PATCH 2/6] drm/i915: tidy up initialisation failure paths (GEM &
GIT: [PATCH 3/6] drm/i915: tidy up initialisation failure paths (legacy)
GIT: [PATCH 4/6] drm/i915: unmap the correct page in
GIT: [PATCH 5/6] drm/i915: HWSP should be unmapped earlier in LRC teardown
GIT: [PATCH 6/6] drm/i915: consolidate LRC mode HWSP setup & teardown
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