Hi all, I am using QMI together with QMAP when configuring and connecting my LTE/5G modules. This all works well, but I have noticed something strange when modules are disconnected from the host. Most disconnects goes fine and everything related to module is removed, but sometimes it happens that the network interface is stuck.
Even though the "disconnected" messages appear in dmesg, etc., I can still see the network interfaces in the output from "ifconfig" or "ip link". When I look in /sys/class/net, I can see that there either are broken symlinks or regular files belonging to the interface that is stuck. Running "ip link del" just gives an error, the same goes when I try to clean up /sys/class/net manually. There are no error messages printed in for example dmesg when the problem occurs, and the modem works fine after it connects to my host again (albeit with different network interface names). I have not been able to reliably reproduce the issue, but I have so far only seen it on "fast" (x86-based) devices. On the "slow" devices that I have tested (like mt7621), I have not been able to trigger the problem. I do not see the issue at all when using QMI without QMAP. I tried to look at the code in qmi_wwan, but couldn't find anything wrong. with the QMAP clean-up code. Does anyone know what might be wrong or where to start or keep looking? Thanks in advance for any help, Kristian
