drm/i915: Serialize insertion into the file->mm.request_list
Currently, we remove the from per-file request list for throttling and retirement under a dedicated spinlock, but insertion is governed by struct_mutex. This needs to be the same lock so that the retirement/insertion of neighbouring requests (at the tail) doesn't break the list. Signed-off-by:Chris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.auld@intel.com> Reviewed-by:
Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190820080907.4665-1-chris@chris-wilson.co.uk
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