On Thu, Apr 23, 2015 at 10:07:35AM +0530, Niranjan H Y wrote: > Hello Everyone, > > I'm newbie to driver development & have a question on CDC NCM gadget driver. > > When I load the module g_ncm.ko on the target board > and execute "lsusb" on host, there is some delay in response. > (about 5-10 seconds) > > However, if I trim the string as shown below (in code changes), > "lsusb" responds quickly. I was wondering if anyone could help > me understand the reason for this behavior. > > I'm looking at kernel version 3.0.35. > https://github.com/boundarydevices/linux-imx6/blob/boundary-imx_3.0.35_4.1.0/drivers/usb/gadget/f_ncm.c#L341 3.0 is really old and obsolete, have you tried a modern, newer kernel? Also, run usbmon on the host and see where the delay is, that should give you an idea of what is going on. 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
