Bug#780818: lvm2 should never try to access /dev/mmcblk0rpmb (avoid hangs)

[Daniel Kahn Gillmor <dkg@fifthhorseman.net>]

On Mon 2015-04-06 15:29:23 -0400, Ben Hutchings wrote:
> Ideally the driver would avoid doing whatever it is that results in a
> hang, or would expose the RPMB only if it's really accessible.  I
> suspect that where access to the RPMB hangs this is because the system
> firmware (BIOS/EFI) has intentionally disabled access before handing
> over to the OS.

That seems like a plausible explanation of the situation to me, but i
don't know enough to tell if that's the case on the machinery i've
tested with.

> Hiding RPMBs seems to be a popular workaround, and I doubt that it will
> be useful to access them under a Debian system or other free operating
> system, so that's what I intend to do.  If we need to change that later
> we can add a module parameter to override this.

Thanks, this seems like a sensible workaround for the moment.

        --dkg