This is not a kernel issue, this is a by default behaviour:
You can/should use udev to force your kernel assign arbitrary names to devices
as it finds them.
Take a look at my file /etc/udev/rules.d/50-local.rules:
# REGLAS PARA LOS DISPOSITIVOS QUE QUEREMOS CONTROLAR POR NOMBRE
BUS=="usb", SYSFS{manufacturer}=="Prolific Technology Inc.",
SYSFS{product}=="USB-Serial Controller",KERNEL=="ttyUSB[0123]",
SYMLINK+="misterhouse"
BUS=="usb", SYSFS{manufacturer}=="FTDI", KERNEL=="ttyUSB[0123]",
SYMLINK+="wmr918"
You must find unique SYSFS strings to each of your devices and SYMLINK
an arbitrary name to it (this are my serial to USB adapters for serial
misterhouse home control software and a WMR918 weather Station with
serial output). Take a look at udev's HOWTOs all over the net, they're
quite useful.
Hope this helps!
--
Two USB serial adapters get different /dev/ttyUSBn names after reboot
https://bugs.launchpad.net/bugs/107208
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