> Hardware experiments show that the negative return value is not just "-EPROBE_DEFER". How much will this specific error code influence our understanding of the discussed software situation? >>> + ret = udc_controller->irq ? : -ENODEV; >> Will it be clearer to specify values for all cases in such a conditional operator >> (instead of leaving one case empty)? > > I don't know what you mean of "instead of leaving one case empty". I suggest to reconsider also the proposed specification “… ? : …”. Regards, Markus