linux-kernel - Re: Possible issue with dangling PCI BARs

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Message-Id: <1197538163.15741.124.camel@pasglop>
Date:	Thu, 13 Dec 2007 20:29:23 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
Cc:	Robert Hancock <hancockr@...w.ca>,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Possible issue with dangling PCI BARs


On Thu, 2007-12-13 at 12:14 +0300, Ivan Kokshaysky wrote:
> On Thu, Dec 13, 2007 at 04:26:42PM +1100, Benjamin Herrenschmidt wrote:
> > I can try to whip up some code tomorrow I suppose, though I'm always
> > afraid some dodgy x86 setup will blow up...
> 
> That scares me too, but something like pci_dangling_bar(dev, idx) with
> a default (for now) no-op implementation in asm-generic/pci.h should
> be safe...

Well, the code that detects collisions and "unsets" a resource is arch
in the first place, and so is pcibios_enable_device().

So I'm going to do a powerpc implementation & test it a bit with what I
have around, and then do an x86 since with my latest (pending for .25)
patches. powerpc PCI code is -very- similar to x86.

Cheers,
Ben.


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