Hello Felix,
thanks for your reply.
As you can see the usb1 and usb2 are swapped!
The problem now is that the ModemManager is using the syspath
to reference the modem in the uci configuration [2]. If the modem's
syspath is now random, the system can no longer find the modem and
cannot establish a connection.
1. Does anyone have the same problem?
2. Is the path of usb<x> randomly intentional?
3. Can I somehow force the path across a restart?
I think the most likely cause is more parallelization in device probe
in order to speed up boot time. Not sure if there is a way to make it
deterministic, but even if there is, it might still change across
kernel upgrades.
I have already thought that this is probably due to when the device is
ready and then the driver is loaded to speed up the load time during
boot.
In my opinion, the best course of action is to just deal with it by
changing the code to no longer rely on usbX names. Better make it
depend on the sysfs path, similar to wifi-device path handling in the
wireless config.
I am already using the sysfs path, but if the usbX name changes then
also the
sysfs path changes as well! See the devices I have attached '->'. Or am
I
misunderstanding you?
Boot 1:
root@G3-10940 /sys/bus/usb/devices # ls -la | grep usb
lrwxrwxrwx 1 root root 0 Jul 17 12:56 1-0:1.0 ->
../../../devices/pci0000:00/0000:00:12.0/usb1/1-0:1.0
lrwxrwxrwx 1 root root 0 Jul 17 12:56 1-1 ->
../../../devices/pci0000:00/0000:00:12.0/usb1/1-1
lrwxrwxrwx 1 root root 0 Jul 17 12:56 1-1.2 ->
../../../devices/pci0000:00/0000:00:12.0/usb1/1-1/1-1.2
lrwxrwxrwx 1 root root 0 Jul 17 12:56 1-1.2:1.0 ->
../../../devices/pci0000:00/0000:00:12.0/usb1/1-1/1-1.2/1-1.2:1.0
lrwxrwxrwx 1 root root 0 Jul 17 12:56 1-1:1.0 ->
../../../devices/pci0000:00/0000:00:12.0/usb1/1-1/1-1:1.0
lrwxrwxrwx 1 root root 0 Jul 17 12:56 2-0:1.0 ->
../../../devices/pci0000:00/0000:00:13.0/usb2/2-0:1.0
lrwxrwxrwx 1 root root 0 Jul 17 12:56 2-1 ->
../../../devices/pci0000:00/0000:00:13.0/usb2/2-1
lrwxrwxrwx 1 root root 0 Jul 17 12:56 2-1.3 ->
../../../devices/pci0000:00/0000:00:13.0/usb2/2-1/2-1.3
-> lrwxrwxrwx 1 root root 0 Jul 17 12:56 2-1.3:1.0 ->
../../../devices/pci0000:00/0000:00:13.0/usb2/2-1/2-1.3/2-1.3:1.0
-> lrwxrwxrwx 1 root root 0 Jul 17 12:56 2-1.3:1.1 ->
../../../devices/pci0000:00/0000:00:13.0/usb2/2-1/2-1.3/2-1.3:1.1
-> lrwxrwxrwx 1 root root 0 Jul 17 12:56 2-1.3:1.2 ->
../../../devices/pci0000:00/0000:00:13.0/usb2/2-1/2-1.3/2-1.3:1.2
-> lrwxrwxrwx 1 root root 0 Jul 17 12:56 2-1.3:1.3 ->
../../../devices/pci0000:00/0000:00:13.0/usb2/2-1/2-1.3/2-1.3:1.3
lrwxrwxrwx 1 root root 0 Jul 17 12:56 2-1.3:1.4 ->
../../../devices/pci0000:00/0000:00:13.0/usb2/2-1/2-1.3/2-1.3:1.4
lrwxrwxrwx 1 root root 0 Jul 17 12:56 2-1:1.0 ->
../../../devices/pci0000:00/0000:00:13.0/usb2/2-1/2-1:1.0
lrwxrwxrwx 1 root root 0 Jul 17 12:56 3-0:1.0 ->
../../../devices/pci0000:00/0000:00:10.0/usb3/3-0:1.0
lrwxrwxrwx 1 root root 0 Jul 17 12:56 4-0:1.0 ->
../../../devices/pci0000:00/0000:00:10.0/usb4/4-0:1.0
lrwxrwxrwx 1 root root 0 Jul 17 12:56 usb1 ->
../../../devices/pci0000:00/0000:00:12.0/usb1
lrwxrwxrwx 1 root root 0 Jul 17 12:56 usb2 ->
../../../devices/pci0000:00/0000:00:13.0/usb2
Boot 2:
root@G3-10940 /sys/bus/usb/devices # ls -la | grep usb
lrwxrwxrwx 1 root root 0 Jul 17 12:43 1-0:1.0 ->
../../../devices/pci0000:00/0000:00:13.0/usb1/1-0:1.0
lrwxrwxrwx 1 root root 0 Jul 17 12:43 1-1 ->
../../../devices/pci0000:00/0000:00:13.0/usb1/1-1
lrwxrwxrwx 1 root root 0 Jul 17 12:43 1-1.3 ->
../../../devices/pci0000:00/0000:00:13.0/usb1/1-1/1-1.3
-> lrwxrwxrwx 1 root root 0 Jul 17 12:43 1-1.3:1.0 ->
../../../devices/pci0000:00/0000:00:13.0/usb1/1-1/1-1.3/1-1.3:1.0
-> lrwxrwxrwx 1 root root 0 Jul 17 12:43 1-1.3:1.1 ->
../../../devices/pci0000:00/0000:00:13.0/usb1/1-1/1-1.3/1-1.3:1.1
-> lrwxrwxrwx 1 root root 0 Jul 17 12:43 1-1.3:1.2 ->
../../../devices/pci0000:00/0000:00:13.0/usb1/1-1/1-1.3/1-1.3:1.2
-> lrwxrwxrwx 1 root root 0 Jul 17 12:43 1-1.3:1.3 ->
../../../devices/pci0000:00/0000:00:13.0/usb1/1-1/1-1.3/1-1.3:1.3
lrwxrwxrwx 1 root root 0 Jul 17 12:43 1-1.3:1.4 ->
../../../devices/pci0000:00/0000:00:13.0/usb1/1-1/1-1.3/1-1.3:1.4
lrwxrwxrwx 1 root root 0 Jul 17 12:43 1-1:1.0 ->
../../../devices/pci0000:00/0000:00:13.0/usb1/1-1/1-1:1.0
lrwxrwxrwx 1 root root 0 Jul 17 12:43 2-0:1.0 ->
../../../devices/pci0000:00/0000:00:12.0/usb2/2-0:1.0
lrwxrwxrwx 1 root root 0 Jul 17 12:43 2-1 ->
../../../devices/pci0000:00/0000:00:12.0/usb2/2-1
lrwxrwxrwx 1 root root 0 Jul 17 12:43 2-1.2 ->
../../../devices/pci0000:00/0000:00:12.0/usb2/2-1/2-1.2
lrwxrwxrwx 1 root root 0 Jul 17 12:43 2-1.2:1.0 ->
../../../devices/pci0000:00/0000:00:12.0/usb2/2-1/2-1.2/2-1.2:1.0
lrwxrwxrwx 1 root root 0 Jul 17 12:43 2-1:1.0 ->
../../../devices/pci0000:00/0000:00:12.0/usb2/2-1/2-1:1.0
lrwxrwxrwx 1 root root 0 Jul 17 12:43 usb1 ->
../../../devices/pci0000:00/0000:00:13.0/usb1
lrwxrwxrwx 1 root root 0 Jul 17 12:43 usb2 ->
../../../devices/pci0000:00/0000:00:12.0/usb2
Best regards
Florian
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