linux-kernel - Re: Can we remove pci_find

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Message-ID: <20100111200136.GA29955@suse.de>
Date:	Mon, 11 Jan 2010 12:01:36 -0800
From:	Greg KH <gregkh@...e.de>
To:	Tilman Schmidt <tilman@...p.cc>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	Karsten Keil <isdn@...ux-pingi.de>,
	isdn4linux@...tserv.isdn4linux.de
Subject: Re: Can we remove pci_find_device() yet?

On Mon, Jan 11, 2010 at 08:46:50PM +0100, Tilman Schmidt wrote:
> Am 08.01.2010 05:46 schrieb Greg KH:
> > On Fri, Jan 08, 2010 at 11:22:36AM +1100, Stephen Rothwell wrote:
> >>
> >> This interface has been deprecated since November 2006, so can something
> >> be done about the last users (I think only some ISDN drivers)?
> 
> That would be the HiSax I4L drivers.
> 
> > Ick, the "new" isdn drivers are still not merged that replace those
> > older ones?  I thought that happened a while ago.
> 
> mISDN, which is the designated successor to HiSax, has indeed been
> merged in 2008.
> 
> Trouble is, mISDN's userspace interface is completely different from I4L.
> Removing HiSax would therefore break userspace compatibility for current
> users of HiSax supported devices. In order to switch to mISDN they'll
> have to replace all of their ISDN4Linux applications with equivalent
> mISDN ones, and I'm not even sure there is a replacement for everything.
> 
> Just an idea - as a stopgap measure, couldn't pci_find_device() be made
> a private function of the HiSax drivers? That way, the remainder of the
> kernel won't be polluted by it anymore, and the PCI_LEGACY config option
> can be dropped. Something like this quick and dirty hack:

Close, but if you do this, please name the function
hisax_find_pci_device() or something, and change the drivers to use it
instead.  Also put a big fat warning in the function that calling this
is unsafe for any PCI hotplug type machine.

thanks,

greg k-h
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