Re: sysfs: cannot create duplicate filename

[Matt Fleming <matt-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>]

On 03/21/2013 07:22 AM, Lingzhu Xiang wrote:
> Tested-by: Lingzhu Xiang <lxiang-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Great, thanks!

> Reproduced with 3.9-rc3 in QEMU/OVMF. The kernel gets stuck in a loop.
> 
> Verified with 3.9-rc3 with this patch. The kernel survives. efivarfs
> continues working, though some variables won't show up, as expected.
> 
> [    2.033855] efivars: duplicate variable: Boot0001-8be4df61-93ca-11d2-aa0d-00e098032b8c
> 
> This patch has no real impact for users with normal firmware as tested
> before on a Windows 8 logo desktop.
> 
> For the record, here is how I create duplicate variables in QEMU/OVMF:
> 
> OVMF EmuVariableFvbRuntimeDxe emulates nvram with a reserved area of
> memory (ReserveEmuVariableNvStore). But there seems to be some layers
> of cache above this, so directly writing a new duplicate variable here
> won't make a difference. I ended up writing an EFI app to scan the
> entire memory and replace all L"Boot0004" with L"Boot0001", which
> seemed to actually break things (e.g. dmpstore will get stuck).

Thanks for going to such lengths to test this.

-- 
Matt Fleming, Intel Open Source Technology Center