On Tue, 12 Dec 2006, Dominik Brodowski wrote: > > I'll have to study the code some more. Which kernel did you say you are > > using? > > Latest Linus' git. Today's snd-usb-audio test was with head > 4259cb25d436a79bf6b07d8075423573567c211d (plus an completely unrelated > pcmcia patch, but the related modules didn't even load). > > > > case B) snd-usb-audio device connected to "right" USB port: > > > > > > The flip occurs on or after IRQ status 0004. > > > > > > > > > (unfortunately, without extended USB debug messages) > > > > And in this example there wasn't even a suspend-resume pair to confuse > > the issue, which suggests that the same thing might end up happening even > > without the patch git-bisect identified. Can you try running exactly the > > same test, but with that patch reverted? > > Actually, there _was_ a suspend and resume going on, it just didn't show up > in the logs for I had CONFIG_USB_DEBUG disabled for that test accidentally. > > http://userweb.kernel.org/~brodo/dmesg-autosuspend-2b.txt > > from today confirms it, and I also ran the pre-autosuspend kernel ( its head > is 8c03356a559ced6fa78931f498193f776d67e445 ) to re-check that it is an issue > which appeared with the autosuspend patch.
Okay, I was fooled by the lack of debugging info. And clearly the suspend or resume routine is implicated. This suggests we check the value of the intr_enable register at the entry and exit of both ehci_bus_suspend() and ehci_bus_resume() in ehci_hub.c. You can add the appropriate printk statements easily. Hmmm... Perhaps the final writel() at the end of ehci_bus_resume() isn't getting sent through. The mere act of reading it back might be enough to change the behavior. On the other hand, your latest log suggests that the STS_FLR bit gets set during the ehci_bus_suspend() routine, not the resume routine. So it will be best to check at the beginning and end of both routines. Alan Stern ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
