linux-kernel - Re: [PATCH] Fix compiler warnings for 2.6.23-rc8 on x86

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Date:	Fri, 28 Sep 2007 19:43:47 -0700
From:	Greg KH <greg@...ah.com>
To:	Maarten Bressers <mbres@...too.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix compiler warnings for 2.6.23-rc8 on x86_64

On Sat, Sep 29, 2007 at 12:04:47AM +0000, Maarten Bressers wrote:
> On Fri, 28 Sep 2007 15:49:26 -0700
> Greg KH <greg@...ah.com> wrote:
> 
> > On Fri, Sep 28, 2007 at 08:56:30PM +0000, Maarten Bressers wrote:
> > > This (trivial) patch fixes two compiler warnings for 2.6.23-rc8 on x86_64,
> > > use of deprecated function pci_find_device() and a section mismatch.
> > > Build log and .config file included.
> > > 
> > > Signed-off by: Maarten Bressers <mbres@...too.org>
> > > 
> > > 
> > > diff --git a/drivers/pci/search.c b/drivers/pci/search.c
> > > index c6e79d0..0eb7e9e 100644
> > > --- a/drivers/pci/search.c
> > > +++ b/drivers/pci/search.c
> > > @@ -96,7 +96,7 @@ pci_find_slot(unsigned int bus, unsigned int devfn)
> > >  {
> > >  	struct pci_dev *dev = NULL;
> > >  
> > > -	while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
> > > +	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
> > >  		if (dev->bus->number == bus && dev->devfn == devfn)
> > >  			return dev;
> > >  	}
> > 
> > This is not a trivial patch, it changes the behavior of the code and is
> > buggy.
> > 
> > Please read the documentationfor pci_get_device() on how to use it
> > properly.  It can not be used in pci_find_slot() as the reference
> > counting will be all wrong.  You need to just work to get rid of
> > pci_find_slot() and then remove the whole function to get rid of the
> > warning :)
> > 
> > > -EXPORT_SYMBOL(pci_find_device);
> > > -EXPORT_SYMBOL(pci_find_slot);
> > 
> > What about the modules that want to use these functions?  Are they all
> > now gone?  If so, just drop the whole function.
> > 
> > thanks,
> > 
> > greg k-h
> 
> Greg, thank you for your reply. It seems I'm out of my league here, I 
> just thought I could quickly fix two compiler warnings, obviously this 
> is not the case. I've read the documentation, but I don't think I'll be 
> able to fix this. Sorry for the noise.

No problem, and I don't mean to scare you away at all.  If you want to
work toward getting rid of all of the callers of the pci_find_slot()
function, that would be best, and then the function can be deleted.

If you have questions on how to do that, feel free to ask.

thanks,

greg k-h
-
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