Re: [linux-pm] [RFC PATCH 2/3] PCI: parallel resume for pci devices on bus 0

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On Fri, 19 Dec 2008, Zhang Rui wrote:

> device parallel resume support for PCI devices

There are some PCI devices which won't work right if they are resumed
in parallel.  The example I have in mind is a USB host controller
device with both a high-speed EHCI controller function and some
companion low/full-speed UHCI or OHCI controller functions.  The EHCI
driver relies on the fact that the EHCI controller has a higher
function number and therefore is resumed _after_ the companion
controllers.

We need a way to express dependencies like this between devices.  Or at 
least, there has to be a way to prevent certain devices from resuming 
in parallel.

Alan Stern

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