mptsas driver should not exclude SES devices from mpxio consideration
The mptsas driver (and maybe others as well, but I'm focused on mptsas and that's the only one I could conclusively verify this for) currently excludes optical drives and SES (DTYPE_ESI) from mpxio.
This limitation on SES devices seems somewhat arbitrary, and (when combined with a suitable vhci fops) is not necessary.
The change to remove this limitations is fairly trivial, but to make use of it other supporting work is needed.
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