From: Russell King <rmk@arm.linux.org.uk>
To: Greg KH <greg@kroah.com>
Cc: "Cameron, Steve" <Steve.Cameron@hp.com>,
linux-kernel@vger.kernel.org, "Mathiasen,
Torben" <Torben.Mathiasen@hp.com>,
"Ni, Michael" <Michael.Ni@hp.com>
Subject: Re: PCI hotplug question.
Date: Wed, 5 Mar 2003 08:35:25 +0000 [thread overview]
Message-ID: <20030305083525.G25251@flint.arm.linux.org.uk> (raw)
In-Reply-To: <20030305061520.GA26727@kroah.com>; from greg@kroah.com on Tue, Mar 04, 2003 at 10:15:20PM -0800
On Tue, Mar 04, 2003 at 10:15:20PM -0800, Greg KH wrote:
> I can't find my copy of the PCI Hotplug spec right now (and it's not
> free for download anymore...), but I think that once a user presses the
> latch button, the OS _has_ to power down that slot within a reasonable
> amount of time. So there's no way that a driver could return an error
> to the remove() callback and have a chance to still be around in a
> moment or so. And some systems (ACPI controlled PCI Hotplug), we don't
> have a choice, as the BIOS is about to do the powerdown anyway, and we
> can't stop it.
Not only that, but with Cardbus-based PCI expansion systems, a complete
PCI bus tree could have been removed and be gone before the drivers get
notified, if the user pulls the cardbus card from the slot.
--
Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux
http://www.arm.linux.org.uk/personal/aboutme.html
prev parent reply other threads:[~2003-03-05 8:25 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-04 23:10 PCI hotplug question Cameron, Steve
2003-03-05 6:15 ` Greg KH
2003-03-05 8:35 ` Russell King [this message]
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