raspberrypi/linux — pull request #390 by P33M (2013-10-01 13:37:46+00:00)
Title: dwc_otg: Don't issue traffic to LS devices in FS mode

Issuing low-speed packets when the root port is in full-speed mode
causes the root port to stop responding. Explicitly fail when
enqueuing URBs to a LS endpoint on a FS bus.

This is most often seen when running with dwc_otg.speed=1.