From: Greg KH <greg@kroah.com>
To: linux-hotplug@vger.kernel.org
Subject: Re: unclean yanking out of device?
Date: Thu, 15 Jan 2004 00:34:04 +0000 [thread overview]
Message-ID: <20040115003404.GE10153@kroah.com> (raw)
In-Reply-To: <20040114160002.G57254@forte.austin.ibm.com>
On Wed, Jan 14, 2004 at 04:36:29PM -0800, David Brownell wrote:
> >>>That pci controller needs to tell the OS that it is going to shut down
> >>>that pci slot. Otherwise that pci controller violates the PCI spec.
> >>
> >>I was only half-joking about the cosmic ray. The cosmic ray violated
> >>the PCI spec. boo hoo. Now what? Tell it to go back to the supernova
> >>it came from?
> >
> >
> >No, tell the driver that it is going to be shut down. The driver will
> >do so, and then you can safely yank it out. That's what all pci hotplug
> >controller drivers do, why be different?
>
> Actually there's a good argument that every PCI driver for hardware that
> can be packaged onto CardBus _should_ handle those "unclean" shutdown
> modes ... and as Linus has observed, it's awfully convenient that most
> such cases also cause reads from those devices to return all-ones!
>
> The electrical details are of course a different issue. Cardbus and
> the various other kinds of PCI hotplug have different answers, so
> there's no universal guarantee that drivers will get notified first.
Yes, but even cardbus notifies the driver that the device is now gone,
which is the main point I was trying to make. We already have the
framework for this to work properly with all PCI devices and drivers,
let's not go try to make up a new one.
thanks,
greg k-h
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next prev parent reply other threads:[~2004-01-15 0:34 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-14 22:00 unclean yanking out of device? linas
2004-01-14 22:15 ` Måns Rullgård
2004-01-14 22:19 ` Greg KH
2004-01-14 23:08 ` linas
2004-01-14 23:24 ` Greg KH
2004-01-14 23:49 ` Paul Ionescu
2004-01-14 23:57 ` linas
2004-01-15 0:19 ` Oliver Neukum
2004-01-15 0:19 ` Greg KH
2004-01-15 0:34 ` Greg KH [this message]
2004-01-15 0:36 ` David Brownell
2004-01-15 1:16 ` linas
2004-01-15 1:20 ` linas
2004-01-15 1:33 ` Greg KH
2004-01-15 1:35 ` Greg KH
2004-01-15 1:57 ` linas
2004-01-15 17:17 ` Richard Troth
2004-01-15 18:38 ` linas
2004-01-15 21:22 ` David Hinds
2004-01-24 0:38 ` Greg KH
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