linux-kernel - Re: pci_get_device_reverse(), why does Calgary need this?

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Message-ID: <20080215071703.GA9022@kroah.com>
Date:	Thu, 14 Feb 2008 23:17:03 -0800
From:	Greg KH <greg@...ah.com>
To:	Muli Ben-Yehuda <muli@...ibm.com>
Cc:	jdmason@...zu.us, bzolnier@...il.com, linux-ide@...r.kernel.org,
	linux-pci@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org,
	discuss@...-64.org
Subject: Re: pci_get_device_reverse(), why does Calgary need this?

On Wed, Feb 13, 2008 at 10:14:59AM -0800, Greg KH wrote:
> On Wed, Feb 13, 2008 at 07:47:11PM +0200, Muli Ben-Yehuda wrote:
> > On Wed, Feb 13, 2008 at 09:32:03AM -0800, Greg KH wrote:
> > 
> > > Is there some reason you aren't using the "real" PCI driver api here
> > > and registering a pci driver for these devices?  That would take the
> > > whole "loop over all pci devices" logic out of the code entirely.
> > 
> > I recall we had a reason, but I no longer recall what it was. Some
> > reason the "real" PCI driver API didn't fit at the time. If someone
> > were to whip up a working patch, I'd happily apply it.
> 
> "at the time"?  It's been in place since the 2.2 days :)
> 
> Is the problem that other drivers also want access to this PCI device
> for some reason?
> 
> I'll whip up a patch for you to test with in a bit...

Hm, that's wierd.  I thought I got something, until I realized that you
are doing a lot of logic before you ever even determine that your
hardware is present in the system.  Why are you calling
calgary_locate_bbars() and doing all of that work?  Or am I mising
something in the code flow here?

Also, it looks like you use the pci_get_device() to find the pci device,
then you do somethings, and then drop the device, never to use it again.

So, a traditional "probe" might not work as well, but it could be used
if you want to.

thanks,

greg k-h
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