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From: "Ethin Probst" <harlydavidsen@gmail.com>
Date: Sat, 17 Jul 2021 11:41:28 -0500
Message-ID: <CAJQtwF3SEZZBDNa6sKHYxZJBKMzgaeBiiTKG0bnJ0Yfrz5iK+w@mail.gmail.com>
Subject: OpenProtocol() giving me EFI_INVALID_PARAMETER
To: devel@edk2.groups.io
Cc: "Leif Lindholm (Nuvia address)" <leif@nuviainc.com>, Andrew Fish <afish@apple.com>, Ray Ni <ray.ni@intel.com>
Content-Type: text/plain; charset="UTF-8"

Hey all,

So my UsbAudio.efi app has hit a bit of a roadblock. This code:

```C
    status = st->BootServices->OpenProtocol(handles[i],
&gEfiUsbIoProtocolGuid, (void**)&UsbIo, imageHandle, NULL,
EFI_OPEN_PROTOCOL_EXCLUSIVE);
    if (EFI_ERROR(status)) {
      Print(L"%r, skipping\n", status);
      continue;
    }
```
Is giving me EFI_INVALID_PARAMETER and I don't know why. I don't think
I'm violating any of its constraints, according to the specification,
and I haven't touched this code since it was written. It also happens
irregularly: sometimes it happens on the USB audio streaming device,
or if I have a device plugged in it might happen on that device, you
get the idea. But it doesn't consistently fail. Does anybody have any
idea what's going on?

-- 
Signed,
Ethin D. Probst