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With async VM_BIND, the actual pgtable updates are deferred. Synchronously, a list of map/unmap ops will be generated, but the actual pgtable changes are deferred. To support that, split out op handlers and change the existing non-VM_BIND paths to use them. Note in particular, the vma itself may already be destroyed/freed by the time an UNMAP op runs (or even a MAP op if there is a later queued UNMAP). For this reason, the op handlers cannot reference the vma pointer. Signed-off-by: Rob Clark <robdclark@chromium.org> Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com> Tested-by: Antonino Maniscalco <antomani103@gmail.com> Reviewed-by: Antonino Maniscalco <antomani103@gmail.com> Patchwork: https://patchwork.freedesktop.org/patch/661516/