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From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: Scott Talbert <swt@techie.net>
Cc: linux-efi <linux-efi@vger.kernel.org>
Subject: Re: Boot regression in 4.8 for Mac Pro server
Date: Thu, 12 Sep 2019 00:17:30 +0100	[thread overview]
Message-ID: <CAKv+Gu_9oeMWA0_dcBkg1s2XaR4H_axGgjQ9pWELACD9uQ-0hg@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.21.1909111635530.3954@bear.techie.net>

On Wed, 11 Sep 2019 at 21:48, Scott Talbert <swt@techie.net> wrote:
>
> Hi,
>
> I just recently discovered a boot regression that occurred starting in 4.8
> on a Mac Pro Mid-2012 server (MacPro5,1).  Yes, I realize this problem is
> over 3 years old.  Obviously, I haven't been using Linux on this hardware
> in a while.  :-)  I bisected the regression to
> 475fb4e8b2f4444d1d7b406ff3a7d21bc89a1e6f "efi / ACPI: load SSTDs from EFI
> variables".  And indeed, v5.3-rc7 will boot if I comment out the
> efivar_ssdt_load() call, as in:
>
> $ git diff
> diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
> index ad3b1f4866b3..691a8671a2ba 100644
> --- a/drivers/firmware/efi/efi.c
> +++ b/drivers/firmware/efi/efi.c
> @@ -364,8 +364,8 @@ static int __init efisubsys_init(void)
>          if (error)
>                  goto err_put;
>
> -       if (efi_enabled(EFI_RUNTIME_SERVICES))
> -               efivar_ssdt_load();
> +       //if (efi_enabled(EFI_RUNTIME_SERVICES))
> +       //      efivar_ssdt_load();
>
>          error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
>          if (error) {
>
>
> Any thoughts on how to fix this?
>

Thanks for the report. It appears the SSDT loading code is slightly
broken, in the sense that it always iterates over all EFI variables
regardless of whether an SSDT override was actually requested on the
command line, which is silly.

I'll have a patch out shortly, and I'll put you on cc. Please test it
and report back.

      reply	other threads:[~2019-09-11 23:17 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-11 20:42 Boot regression in 4.8 for Mac Pro server Scott Talbert
2019-09-11 23:17 ` Ard Biesheuvel [this message]

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