Hi list, Commit 3e4f8e21c4f27bcf30a48486b9dcc269512b79ff "USB: core: fix check for duplicate endpoints" is causing a regression with devices based on the Fresco Logic FL2000 chip, i.e. it is totally unusable. The issue was first reported on the osmocom-sdr mailing list [1] and I can reproduce it on my machine with 5.5.0-rc6, with rc5 everything is working fine. By reverting the commit mentioned above, it is working as well. When connecting the device with rc6, I see the following dmesg output: https://steve-m.de/files/fl2000_dmesg.txt The output of lsusb -v: https://steve-m.de/files/fl2000_lsusb.txt Output of the Windows tool "USB Device Tree Viewer": https://steve-m.de/files/fl2000_usbtreeview.txt Output of the USB-IF USB 3.0 Chapter 9 tests with a version from around the time the FL2000 was released to market (passing): https://steve-m.de/files/fl2000_chapter9.html By looking at the lsusb output, it almost seems like a descriptor parsing issue, that now causes trouble after introducing the duplicate endpoint testing. Regards, Steve [1] https://lists.osmocom.org/pipermail/osmocom-sdr/2020-January/002025.html
