Dear Sarah, We noticed a couple of problems with the Linux xHCI driver: 1. There is a problem with URB cancellation for USB 2.0 device on USB 3.0 host. When we disable our device, we cancel all pending URBs by calling ioctl with the request code of USBDEVFS_DISCARDURB. When we re-enable our device, we submit new URBs, but when we try to reap them, the program hangs (not every time, but pretty often). The same code works if the device is plugged into the EHCI port, and we also don't see any hanging with xHCI host if we don't do URB cancellation, but have our device terminate URBs by sending zero-length packets instead. 2. Clear Halt of EP does not reset the Sequence number if the device is a USB 3.0 device, while it seems that clear halt properly resets the toggle bits if the device is 2.0 even on an xHCI host. Thank you Yuliya -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
