linux-kernel - Re: [PATCH 3/3] PCI: pci_slot: grab refcount on slot's bus

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Message-ID: <20090330164542.GC30433@ldl.fc.hp.com>
Date:	Mon, 30 Mar 2009 10:45:42 -0600
From:	Alex Chiang <achiang@...com>
To:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
Cc:	jbarnes@...tuousgeek.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, lenb@...nel.org
Subject: Re: [PATCH 3/3] PCI: pci_slot: grab refcount on slot's bus

* Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>:
> Alex Chiang wrote:
> > diff --git a/drivers/acpi/pci_slot.c b/drivers/acpi/pci_slot.c
> > index cd1f446..c7ad9f2 100644
> > --- a/drivers/acpi/pci_slot.c
> > +++ b/drivers/acpi/pci_slot.c
> > @@ -63,6 +63,7 @@ struct acpi_pci_slot {
> >  	acpi_handle root_handle;	/* handle of the root bridge */
> >  	struct pci_slot *pci_slot;	/* corresponding pci_slot */
> >  	struct list_head list;		/* node in the list of slots */
> > +	struct pci_bus *bus;		/* bus the slot is on */
> >  };
> 
> I don't think we need an additional 'bus' field in the struct
> acpi_pci_slot. At the register_slot(), we already know the
> address of struct pci_bus. At the acpi_pci_slot_remove(), I
> think we can get the address of struct pci_bus as follows.
> 
> 		if (slot->root_handle == handle) {
> 			struct pci_bus *pbus = slot->pci_slot->bus;
> 			list_del(&slot->list);
> 			pci_destroy_slot(slot->pci_slot);
> 			put_device(&pbus->dev);
> 			kfree(slot);
> 		}

Ok, that is a little cleaner, I'll do it your way.

Thanks for the review.

/ac

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