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Closing and reopening a USB endpoint will clear any halt status recorded by the host controller, but may leave the endpoint halted at the device. This will cause the first packet submitted to the reopened endpoint to be lost, before the automatic stall recovery mechanism detects the halt and resets the endpoint. This is relatively harmless for USB network or HID devices, since the wire protocols will recover gracefully from dropped packets. Some protocols (e.g. for USB mass storage devices) assume zero packet loss and so would be adversely affected. Fix by allowing any device endpoint halt status to be cleared on a freshly opened endpoint. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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