On Thursday 05 April 2007 1:04 pm, Alan Stern wrote:
> This patch (as880) strives to keep the PM core's idea of a USB
> interface's power state in synch with usbcore's own idea. In the end
> this doesn't really matter, but it's better to be consistent.
ISTR trying this originally and watching it break things in some
of the test scenarios I tried. Quite a surprise actually. And as
I recall, it interacted with the issue in your patch #7/11 ...
What was your test matrix?
- USB_SUSPEND on and off?
- All host controller drivers?
- Devices with remote wakeup enabled? HCDs? Both, using it?
- ...
I remember identifying at least half a dozen factors that needed
testing to make sure all code paths got hit ... some worked this
way, some didn't. My test matrix covered each factor on/off, and
various populat combinations. Retesting after each bugfix was a
PITA ... 20 minutes per test, if they succeeded; sigh.
I think that USB_SUSPEND was the key factor I saw, or remote wakeup.
- Dave
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