[edk2-devel] OpenProtocol() giving me EFI_INVALID_PARAMETER
Andrew Fish via groups.io
afish=apple.com at groups.io
Sat Jul 17 16:55:29 UTC 2021
> On Jul 17, 2021, at 9:41 AM, Ethin Probst <harlydavidsen at gmail.com> wrote:
>
> 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;
> }
> ```
How are you constructing handle[]? Could it have gotten stale? You could print out the value of handle[I] on the failure.
The contents of a handle are not defined, but the current implementation is a pointer to an IHANDLE internal data structure in the DXE Core. If you are at the UEFI Shell and you `dh -v <handleNum> it will show the <handleNum> and the value.
Shell> dh -v 98
98: 6d5CF18
….
I think you can `dh -p UsbIo’ to get the list of the UsbIo handles.
So you can poke around and see what is happening on that handle.
I guess the handle[] array could be getting corrupted? So you could check for that?
Thanks,
Andrew Fish
> 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
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