linux-kernel - Re: [PATCH] x86/reboot: Add Dell Optiplex 7450 AIO reboot quirk

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Message-ID: <CAJ=jquaKUGd90-wRtcSQGtZBPzZD8keadwpJZqMdi3+AMYyHXw@mail.gmail.com>
Date:	Thu, 14 Jul 2016 21:16:00 +0800
From:	Alex Hung <alex.hung@...onical.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/reboot: Add Dell Optiplex 7450 AIO reboot quirk

Hi Ingo,

I agree with you but it can affect a lot of systems according to
163ea310b68bdde89b1ac633fbf8c0db290d3f86.

Do you think we should invert 163ea310 instead?

On Thu, Jul 14, 2016 at 8:58 PM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Alex Hung <alex.hung@...onical.com> wrote:
>
>> Dell Optiplex 7450 AIO works with BOOT_ACPI; however, the quirk for
>> "OptiPlex 745" changes its boot method to BOOT_BIOS and causes 7450 AIO
>> hangs when rebooting; as a result, 7450 AIO is appended to overwrite
>> BOOT_BIOS by BOOT_ACPI in order not to break the original 745 series
>>
>> Signed-off-by: Alex Hung <alex.hung@...onical.com>
>> ---
>>  arch/x86/kernel/reboot.c | 21 +++++++++++++++++++++
>>  1 file changed, 21 insertions(+)
>>
>> diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
>> index b7e1d5f..b404d05 100644
>> --- a/arch/x86/kernel/reboot.c
>> +++ b/arch/x86/kernel/reboot.c
>> @@ -55,6 +55,19 @@ bool port_cf9_safe = false;
>>   */
>>
>>  /*
>> + * Some machines require the "reboot=a" commandline options
>> + */
>> +static int __init set_acpi_reboot(const struct dmi_system_id *d)
>> +{
>> +     if (reboot_type != BOOT_ACPI) {
>> +             reboot_type = BOOT_ACPI;
>> +             pr_info("%s series board detected. Selecting %s-method for reboots.\n",
>> +                     d->ident, "ACPI");
>> +     }
>> +     return 0;
>> +}
>> +
>> +/*
>>   * Some machines require the "reboot=b" or "reboot=k"  commandline options,
>>   * this quirk makes that automatic.
>>   */
>> @@ -395,6 +408,14 @@ static struct dmi_system_id __initdata reboot_dmi_table[] = {
>>                       DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
>>               },
>>       },
>> +     {       /* Handle problems with rebooting on Dell Optiplex 7450 AIO */
>> +             .callback = set_acpi_reboot,
>> +             .ident = "Dell OptiPlex 7450 AIO",
>> +             .matches = {
>> +                     DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
>> +                     DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 7450 AIO"),
>> +             },
>> +     },
>
> I think it would be better to limit the original "Dell Optiplex 745" quirk to that
> machine alone instead of quirking the quirk on one of the (known) newer models
> with longer strings.
>
> Thanks,
>
>         Ingo



-- 
Cheers,
Alex Hung