Re: [PATCH v2 07/11] ACPI: acpi_pci_unbind should clean up properly after acpi_pci_bind

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Alex Chiang wrote:
In acpi_pci_bind, we add _PRT information for non-bridge devices, but
we never delete that information in acpi_pci_unbind.

We also set device->ops.bind and device->ops.unbind, but never clear
them out.

Let's make acpi_pci_unbind clean up what we did in acpi_pci_bind.

Cc: Bjorn Helgaas <bjorn.helgaas@xxxxxx>
Signed-off-by: Alex Chiang <achiang@xxxxxx>
---

 drivers/acpi/pci_bind.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/pci_bind.c b/drivers/acpi/pci_bind.c
index 62cb383..5fa1c5e 100644
--- a/drivers/acpi/pci_bind.c
+++ b/drivers/acpi/pci_bind.c
@@ -106,14 +106,21 @@ EXPORT_SYMBOL(acpi_get_pci_id);
static int acpi_pci_unbind(struct acpi_device *device)
 {
+	struct pci_bus *bus;
 	struct pci_dev *dev;
dev = acpi_get_pci_dev(device->handle);
 	if (!dev)
 		return 0;
- if (dev->subordinate)
-		acpi_pci_irq_del_prt(dev->subordinate);
+	if (dev->subordinate) {
+		bus = dev->subordinate;
+		device->ops.bind = NULL;
+		device->ops.unbind = NULL;
+	 } else
+		bus = dev->bus;
+
+	acpi_pci_irq_del_prt(bus);

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,
Kenji Kaneshige


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