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1b102d2fe1
Some shared memory mailboxes may have empty receive operation, because the data are polled by upper layers directly from the shared memory region, and there is no completion interrupt or bit of any sort. Allow empty .recv callback, and if the .recv callback is empty, exit from mbox_recv() right away, because any polling for completion here would be meaningless. Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org> Reviewed-by: Alice Guo <alice.guo@nxp.com>