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Re: [PATCH 1/1] Fix PCIe LER when GRUB2 accesses non-enabled MMIO data f

From: Daniel Kiper
Subject: Re: [PATCH 1/1] Fix PCIe LER when GRUB2 accesses non-enabled MMIO data from VGA
Date: Thu, 29 Mar 2018 11:36:57 +0200
User-agent: Mutt/1.3.28i

On Thu, Mar 29, 2018 at 05:29:01PM +0800, Michael Chang wrote:
> On Thu, Mar 29, 2018 at 11:02:51AM +0200, Daniel Kiper wrote:
> > On Wed, Mar 28, 2018 at 11:42:18AM -0500, address@hidden wrote:
> > > A GPU inserted into a PCIe I/O slot disappears during system startup.
> > > The problem centers around GRUB and a specific VGA init function in
> > > efi_uga.c.  This causes an LER (link error recorvery) because the MMIO
> > > memory has not been enabled before attempting access.
> > >
> > > The fix is to add the same coding used in other VGA drivers, specifically
> > > to add a check to insure that it is indeed a VGA controller.  And then
> > > enable the MMIO address space with the specific bits.
> > >
> > > Signed-off-by: Mike Travis <address@hidden>
> > > Reviewed-by: Michael Chang <address@hidden>
> > > Reviewed-by: Daniel Kiper <address@hidden>
> >
> > Well, please do not add somebody RB tag if he/she did not explicitly
> > asked you to do that. And even in that case I was not able to look at
> > this patch in advance. So, my RB should not be here. Additionally, in
> > this situation I would like to ask if Michael approved his RB?
> We did have discussion about the patch before it was submitted upstream but I
> did not ask for RB as well.
> > Anyway, patch LGTM except one nitpick. I will apply the patch, in a week or
> > so, with Michael's RB if I get confirmation that he approved it earlier.
> As I did not ask for it, it has to be removed.

OK, I will commit this patch without your RB.


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