Re: [PATCH] Add support of Huawei EM770 modem

In oFono code, "device4" represents the modem, while "device1" is the udev_device when calling function add_huawei_em770(modem, udev_device). When I check if it's ttyUSB2 or not in my code, I think I'm checking the device1 and its sysname (Showed as KERNEL in device1, but not the one showed in /dev directory), and in the context of this modem (device4). I do believe there may be some other ttyUSB2 in the system, for example, we have another em770 modem pluged in. But these two ttyUSB2 are in different context. I ever tried to change the name showed in /dev directory by writing some udev rules, but this sysname (KERNEL) seems stable (It's still ttyUSB2). Is it possible this sysname gets changed under some circumstance expect the kernel or driver changes? If not, I still think it's safe and convenient to check this value here.