Re: Totally broken PCI PM calls

From: Russell King (rmk+lkml_at_arm.linux.org.uk)
Date: 10/12/04

  • Next message: Ankit Jain: "Re: Difference in priority" 
    Date:	Tue, 12 Oct 2004 10:27:23 +0100
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>

    On Tue, Oct 12, 2004 at 08:28:07AM +1000, Benjamin Herrenschmidt wrote:
    > Definitely. One thing is: how to do it instead ? I've been thinking
    > about it for a while and am still wondering... do we want a list
    > mecanism with add/remove notifiers so the PM walk can keep in sync
    > with devices added/removed ? or should addition/removal be simply
    > postponed until the end of the sleep/wakeup process (I tend to vote
    > for that).

    What about the case where you're walking the tree for a resume, and
    you've hotplugged a whole tree of devices which have a similar bus
    setup to the original.

    Yes, I'm thinking of the case of Cardbus with hotpluggable PCI buses.
    If we detect that the "bridge" at the top of the chain has changed,
    we _really_ don't want to try to restore the state of the child
    devices - they may have the same bus IDs, but they could well object
    to being inappropriately setup.

    Sure, we can say "don't do that then" but I suspect the exact same
    problem is present with USB, and USB is far more liable to have this
    type of abuse than PCI. 

    -- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 PCMCIA      - http://pcmcia.arm.linux.org.uk/
                 2.6 Serial core
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