Re: [PATCH] PCI: check if a bus is added before removing it

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On Sun, Jan 25, 2009 at 05:25:02AM +0800, Greg KH wrote:
> On Sun, Jan 25, 2009 at 12:41:34AM +0800, Yu Zhao wrote:
> > Signed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx>
> > ---
> >  drivers/pci/remove.c |    3 +++
> >  1 files changed, 3 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
> > index 042e089..caf8e1e 100644
> > --- a/drivers/pci/remove.c
> > +++ b/drivers/pci/remove.c
> > @@ -71,6 +71,9 @@ void pci_remove_bus(struct pci_bus *pci_bus)
> >  	down_write(&pci_bus_sem);
> >  	list_del(&pci_bus->node);
> >  	up_write(&pci_bus_sem);
> > +	if (!pci_bus->is_added)
> > +		return;
> 
> What race condition is this solving?

pci_bus_add_child() sets the 'is_added' if a bus is successfully
registered, so I guess the reverse operation should check it too.
Otherwise, the 'is_added' is useless and should be removed :-)
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