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Date: Wed, 21 Oct 2009 21:36:43 -0400 (EDT) From: Alan Stern <stern@...land.harvard.edu> To: Laurent Pinchart <laurent.pinchart@...asonboard.com> cc: Ozan Çağlayan <ozan@...dus.org.tr>, <linux-media@...r.kernel.org>, linux-kernel <linux-kernel@...r.kernel.org>, USB list <linux-usb@...r.kernel.org> Subject: Re: uvcvideo causes ehci_hcd to halt On Thu, 22 Oct 2009, Laurent Pinchart wrote: > On Wednesday 21 October 2009 22:09:46 Ozan ÃaÄlayan wrote: > > Laurent Pinchart wrote: > > > Probably because hal opens the device to query its capabilities and > > > closes it right after. The driver submits the interrupt URB when the > > > first user opens the device and cancels it when the last user closes the > > > device. > > > > So who's guilty now? > > > > :) > > Not me :-) > > I don't think there's anything wrong with submitting an interrupt URB and > canceling it soon after. Nothing wrong at all. Even if hal didn't do this, the same thing might very well occur the second time somebody ran a program accessing the video device. The real problem will be to figure out why the hardware isn't turning off the periodic schedule. It might be a timing issue (the schedule was running too briefly before the driver tried to disable it). That could explain why it shows up only occasionally. But if it isn't, I have no idea what the underlying cause is or how to fix it. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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