Re: [linux-pm] [patch/rft 2.6.17-rc2] swsusp resume must not device_suspend()

Alan Stern
2006-04-26T15:38:50Z

On Wed, 26 Apr 2006, Rafael J. Wysocki wrote:

> > So under these circumstances, how does it hurt anything to reset the
> > resume device rather than to freeze it?
>
> It just shouldn't be necessary. Actually I think the resume device shouldn't
> be frozen too.

Well, you wouldn't want it doing DMA to unknown memory areas while you're
trying to place the image data in those same areas, would you? And when
the image is reactivated, you wouldn't want the device generating
interrupt requests while its driver still thinks it is suspended. (Or if
it doesn't even have a driver in the image.)

And don't say that no resume device would ever do DMA or generate IRQs
while it was idle! What if it was a remote disk accessible via a network
interface?

Alan Stern

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