drm/i915: Pull the context->pin_count dec into the common intel_context_unpin
As all backends implement the same pin_count mechanism and do a dec-and-test as their first step, pull that into the common intel_context_unpin(). This also pulls into the caller, eliminating the indirect call in the usual steady state case. The intel_context_pin() side is a little more complicated as it combines the lookup/alloc as well as pinning the state, and so is left for a later date. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180517212633.24934-4-chris@chris-wilson.co.uk
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