linux-kernel - Re: [PATCH v2 07/11] ACPI: acpi_pci_unbind should clean up properly after acpi_pci

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Date:	Mon, 08 Jun 2009 12:23:21 +0900
From:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
To:	Alex Chiang <achiang@...com>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	lenb@...nel.org, linux-acpi@...r.kernel.org,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v2 07/11] ACPI: acpi_pci_unbind should clean up	properly
 after acpi_pci_bind

Alex Chiang wrote:
> * Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>:
>>>  
>> I have a concern about this change.
>>
>> The acpi_pci_irq_del_prt() against dev->bus removes not only
>> the _PRT entries for PCI function corresponding to specified
>> acpi_device, but also other _PRT entries for working PCI
>> devices/functions on the same bus. As a result, interrupt
>> initialization for those PCI functions would no longer work
>> properly after that.
>>
>> So I think we should not call acpi_pci_irq_del_prt() against
>> dev->bus.
> 
> Thanks for the review. I agree with you.
> 
> Here is a respun version of this patch.
> 
> From: Alex Chiang <achiang@...com>
> 
> ACPI: acpi_pci_unbind should clean up properly after acpi_pci_bind
> 
> In acpi_pci_bind, we set device->ops.bind and device->ops.unbind, but
> never clear them out.
> 
> Cc: Bjorn Helgaas <bjorn.helgaas@...com>
> Signed-off-by: Alex Chiang <achiang@...com>
> ---
> diff --git a/drivers/acpi/pci_bind.c b/drivers/acpi/pci_bind.c
> index 62cb383..c9cc650 100644
> --- a/drivers/acpi/pci_bind.c
> +++ b/drivers/acpi/pci_bind.c
> @@ -109,11 +109,13 @@ static int acpi_pci_unbind(struct acpi_device *device)
>  	struct pci_dev *dev;
>  
>  	dev = acpi_get_pci_dev(device->handle);
> -	if (!dev)
> +	if (!dev || !dev->subordinate)
>  		return 0;

This would leak the pci_dev's refcount
if dev != NULL && dev->subordinate == NULL.

Thanks,
Kenji Kaneshige


>  
> -	if (dev->subordinate)
> -		acpi_pci_irq_del_prt(dev->subordinate);
> +	acpi_pci_irq_del_prt(dev->subordinate);
> +
> +	device->ops.bind = NULL;
> +	device->ops.unbind = NULL;
>  
>  	pci_dev_put(dev);
>  	return 0;
> --
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> 
> 


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