On Fri, Nov 13, 2015 at 03:45:24PM -0600, Bin Liu wrote: > Change the permission of usb_dma parameter so it can be used for runtime > debug without reboot. Why would you want to do that? This is only used at init time, so if you change it while the driver is running, I don't think you will actually affect anything. Have you tested this out? thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html