linux-kernel - Re: kernel-4.7 bug in Intel sound and/or ACPI

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Date:	Tue, 21 Jun 2016 09:40:10 -0400
From:	Sinan Kaya <okaya@...eaurora.org>
To:	wim@....tudelft.nl
Cc:	Bjorn Helgaas <helgaas@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	perex@...ex.cz, linux-pci@...r.kernel.org,
	Takashi Iwai <tiwai@...e.com>
Subject: Re: kernel-4.7 bug in Intel sound and/or ACPI

On 6/21/2016 8:47 AM, Wim Osterholt wrote:
>> Can you try the following and see if it makes any difference?
>>
>>
>> --- a/drivers/acpi/pci_link.c
>> +++ b/drivers/acpi/pci_link.c
>> @@ -500,7 +500,7 @@ static int acpi_irq_get_penalty(int irq)
>>         int penalty = 0;
>>
>>         if (irq < ACPI_MAX_ISA_IRQS)
>> -               penalty += acpi_isa_irq_penalty[irq];
>> +               return acpi_isa_irq_penalty[irq];
>>
>>         /*
>>         * Penalize IRQ used by ACPI SCI. If ACPI SCI pin attributes conflict
>> @@ -586,6 +586,10 @@ static int acpi_pci_link_allocate(struct acpi_pci_link *link)
>>                             acpi_device_bid(link->device));
>>                 return -ENODEV;
>>         } else {
>> +               if (irq < ACPI_MAX_ISA_IRQS)
>> +                       acpi_isa_irq_penalty[irq] = acpi_irq_get_penalty(irq) +
>> +                                                       PIRQ_PENALTY_PCI_USING;
>> +
>>
>>
>>
>>> Bjorn
> 
> 
> I tried this on kernel 4.7.0-rc4, but that didn't help. It still tried to
> grab irq7.
> 
> 

Thanks, It was a guess with no proof.

Let's undo the change above and start adding some print statements to collect
data from your system.

Can you add this to the end of acpi_irq_get_penalty function and then send
the output?

	pr_info("%s:%d irq = %d penalty = %d\n", __func__, __LINE__, irq,
		penalty);
 


> Regards, Wim.
> 
> 
> ----- wim@....tudelft.nl -----
> 
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-- 
Sinan Kaya
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project