On Fri, Feb 24, 2012 at 03:17:46PM +0800, Axel Lin wrote:

>  			delay = rdev->desc->ops->set_voltage_time_sel(rdev,
>  						old_selector, selector);
> +			if (delay < 0)
> +				delay = 0;

We should complain if we get an error rather than silently ignore it,
possibly we'll end up returning prior to the ramp finishing which may
break things.