drm/msm: Document and rename preempt_lock
Before adding another lock, give ring->lock a more descriptive name. Signed-off-by:Rob Clark <robdclark@chromium.org> Reviewed-by:
Jordan Crouse <jcrouse@codeaurora.org> Reviewed-by:
Kristian H. Kristensen <hoegsberg@google.com> Signed-off-by:
Rob Clark <robdclark@chromium.org>
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