Zyxel NSA320s doesn't work with bodhi kernels > 5.6 (5 replies)

Hi :)

I installed a recent uboot and a Debian-5.2.9-kirkwood-tld-1-rootfs-bodhi on my Zyxel NSA320s (on USB flash). It was working fine.

Then I wanted to upgrade kernel to the newer one. The last kernel that works reliably is 5.6.5. Newer kernels don't work.

I finally configured netconsole, so I'm now able to see the kernel startup log. I tried once again the most recent kernel 5.9.3. In the logs I see that out of the sudden the USB is disconnected:

[   45.006954][    T5] usb 1-1.3: USB disconnect, device number 5

And then there are lot of messages complaining about I/O issues, like:

[   45.034708][  T334] blk_update_request: I/O error, dev sdb, sector 1941760 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0

I tried multiple times. I also tried different flash disk and the result is the same. Reverting kernel to 5.6 fixes the issue and everything works fine. So it is not a hardware problem (like power supply or broken flash).
I also tried to set usbcore.autosuspend=-1 in kernel arguments, but it didn't help.

Attached the full log.

Any idea how to fix it or what can be wrong?

Cheers,

Marek