cxl/mbox: Construct a users cxl_mbox_cmd in the validation path
This is a step in refactoring the handling of user space mailbox commands. The intent is to have all the validation work originate in cxl_validate_cmd_from_user(). Move the construction and validation of a mailbox command to the validation path. Continue to pass both the out_cmd and the mbox_cmd until handle_mbox_cmd_from_user() learns how to use a mbox_cmd param. Signed-off-by: Alison Schofield <alison.schofield@intel.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Link: https://lore.kernel.org/r/c9fbdad968a2b619f9108bb6c37cef1a853cdf5a.1648687552.git.alison.schofield@intel.comSigned-off-by: Dan Williams <dan.j.williams@intel.com>
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