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Date: Fri, 10 Jun 2016 13:58:45 +0200
From: Ingo Molnar <mingo@kernel.org>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Lukas Wunner <lukas@wunner.de>, Thomas Gleixner <tglx@linutronix.de>,
        cmilsted@redhat.com, Rafa?? Mi??ecki <zajec5@gmail.com>,
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	<linux-tip-commits@vger.kernel.org>
Subject: Re: [tip:x86/urgent] x86/quirks: Add early quirk to reset Apple
 AirPort card
Message-ID: <20160610115845.GA27253@gmail.com>
References: <82c2548dffc6cfbc484b9111b1073f407c946061.1464477483.git.lukas@wunner.de>
 <tip-625a99d9bfd038ea492f57308555bf4e607ce591@git.kernel.org>
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 <20160608200929.GA18981@wunner.de>
 <20160609064803.GA10996@gmail.com>
 <20160609110424.GA19470@wunner.de>
 <CAE9FiQVN25PC_jMG1cDqwrDc_X2gMFwVMnLcgyiMST6_868Aaw@mail.gmail.com>
 <20160609202036.GA19638@wunner.de>
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* Yinghai Lu <yinghai@kernel.org> wrote:

> On 6/9/16, Lukas Wunner <lukas@wunner.de> wrote:
> >
> > Well, the PCI core would also scan such a bus twice AFAICS.
> > And the performance penalty of scanning it twice seems negligible.
> > Early quirks can prevent double execution by setting QFLAG_APPLY_ONCE.
> > (Three quirks have set that flag already.)
> >
> > So I think this shouldn't be a concern.
> 
> I don't know. I would like see sth like following, and that is simple enough.
> 
> Index: linux-2.6/arch/x86/kernel/early-quirks.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/early-quirks.c
> +++ linux-2.6/arch/x86/kernel/early-quirks.c
> @@ -755,10 +755,16 @@ static int __init check_dev_quirk(int nu
>         return 0;
>  }
> 
> +static unsigned char __initdata scanned[256];
>  static void __init early_pci_scan_bus(int bus)
>  {
>         int slot, func;
> 
> +       if (scanned[bus])
> +               return;
> +
> +       scanned[bus] = 1;
> +
>         /* Poor man's PCI discovery */
>         for (slot = 0; slot < 32; slot++)
>                 for (func = 0; func < 8; func++) {

Ok, I removed the fix from tip:x86/urgent from the time being - could you guys 
please send a full version once a final approach is agreed upon?

Thanks,

	Ingo