Re: [Bugfix v5] x86/PCI/ACPI: Fix regression caused by commit 63f1789ec716
From: Bjorn Helgaas
Date: Wed Apr 29 2015 - 09:37:33 EST
On Wed, Apr 29, 2015 at 8:33 AM, Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx> wrote:
> On 2015/4/29 21:20, Bjorn Helgaas wrote:
>> On Tue, Apr 28, 2015 at 7:40 PM, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote:
>>> On Monday, April 20, 2015 11:08:58 AM Jiang Liu wrote:
>>>> + *
>>>> + * Another possible solution is to explicitly filter out IO
>>>> + * port[0xCF8-0xCFF].
>>>> + */
>>>> + res_flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_IO_FIXED;
>> 2) The usage of IORESOURCE_IO_FIXED here seems like a hack. It's not
>> related to other existing use of IORESOURCE_IO_FIXED, and it's not
>> intuitive that supplying IORESOURCE_MEM means "I want all the
>> memory-type resources," but supplying IORESOURCE_IO_FIXED means "I
>> *don't* want the fixed I/O-type resources."
> Yes, the IORESOURCE_IO_FIXED is a hack here. Then how about explicitly
> filtering IOPORT [0xCF8-0xCFF] so we could avoid such a hack.
I'm OK with that, although it should be in an arch-specific hook or something.
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