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Some UEFI USB drivers (e.g. the UsbKbDxe driver in EDK2) will react to a reported EFI_USB_ERR_STALL by attempting to clear the endpoint halt. This is redundant with iPXE's EFI_USB_IO_PROTOCOL implementation, since endpoint stalls are cleared automatically by the USB core as needed. The UEFI USB driver's attempt to clear the endpoint halt can introduce an unwanted 5 second delay per endpoint if the USB error was the result of a device being physically removed, since the control transfer will always time out. Fix by reporting all USB errors as EFI_USB_ERR_SYSTEM instead of EFI_USB_ERR_STALL. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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