On Thu, Nov 21, 2013 at 05:25:43PM +0800, ys6 land wrote: > Hi, greg > Do you know what source code that implement the line setting function > in the kernel source tree? > Or what source code do you think is worth a check? The issue is in your userspace program, not the kernel. best of luck, 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