linux-kernel - Re: [PATCH]PCI:disable resource decode in PCI BAR detection

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Message-Id: <1189973176.6403.20.camel@localhost.localdomain>
Date:	Sun, 16 Sep 2007 22:06:16 +0200
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Greg KH <gregkh@...e.de>, Matthew Wilcox <matthew@....cx>,
	Shaohua Li <shaohua.li@...el.com>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-pci <linux-pci@...ey.karlin.mff.cuni.cz>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH]PCI:disable resource decode in PCI BAR detection

On Thu, 2007-09-13 at 21:32 -0600, Robert Hancock wrote:
> 
> If we do encounter other devices that choke on having the BAR
> disabled 
> during probing then we can add additional quirk logic, but we haven't 
> run into anything like that yet.

Well... if the device needs to be accessed to service an interrupt then
you do have a problem. For example... the PIC :-)

Problem is.. it's not practical nor really feasible generally to have
IRQs off on all CPUs during PCI probing neither... Unless we define that
the initial boot time probing is "special", and the first pass that
actually probes devices (and doesn't muck around with the sysfs
hierarchy etc...) can be run in a special context with all interrupt
servicing disabled on the PIC, though that will require some arch
support.

Ben.

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