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Reading MAC from OF may return -EPROBE_DEFER if underlaying NVMEM device isn't ready yet. In such case pass that error code up and "wait" to be probed later. Signed-off-by: Rafał Miłecki <rafal@milecki.pl> Link: https://lore.kernel.org/r/20220915133013.2243-1-zajec5@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>