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

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Date:	Thu, 4 Jun 2009 17:35:21 -0600
From:	Alex Chiang <achiang@...com>
To:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
Cc:	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

* 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;
 
-	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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