linux-kernel - Re: [linux-pm] Bug in PCI core

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Message-Id: <1160753390.3000.494.camel@laptopd505.fenrus.org>
Date:	Fri, 13 Oct 2006 17:29:50 +0200
From:	Arjan van de Ven <arjan@...radead.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Adam Belay <abelay@....EDU>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Greg KH <greg@...ah.com>, linux-pci@...ey.karlin.mff.cuni.cz,
	Linux-pm mailing list <linux-pm@...ts.osdl.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [linux-pm] Bug in PCI core

On Fri, 2006-10-13 at 16:26 +0100, Alan Cox wrote:
> Ar Gwe, 2006-10-13 am 10:29 -0400, ysgrifennodd Alan Stern:
> > > I'd like to propose that we have the pci config sysfs interface return
> > > -EIO  when it's blocked (e.g. active BIST or D3cold).  This accurately
> > > reflects the state of the device to userspace, reduces complexity, and
> > > could potentially save some memory per PCI device instance.
> > 
> > Could you resubmit your old patches and include a corresponding fix for 
> > this access problem?
> 
> And then you can fix the applications it breaks, like the X server which
> does actually want to know where all the devices are located in PCI
> space.
> 

.. but which could equally well mmap the resource from sysfs ;)


also the thing this patch does is ONLY when the device is effectively
off the bus return -EIO.
One can argue that -EAGAIN is nicer since it's only a temporary
condition though....


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