On Mon, 24 Sep 2012, Sarah Sharp wrote: > On Mon, Sep 24, 2012 at 01:05:08PM -0700, Sarah Sharp wrote: > > On Mon, Sep 24, 2012 at 03:50:04PM -0400, Alan Stern wrote: > > > On Mon, 24 Sep 2012, Sarah Sharp wrote: > > > > > > > When a device with an isochronous endpoint is behind a hub plugged into > > > > the Intel Panther Point xHCI host controller, and the driver submits > > > > multiple frames per URB, the xHCI driver will set the Block Event > > > > Interrupt (BEI) flag on all but the last TD for the URB. This causes > > > > the host controller to place an event on the event ring, but not send an > > > > interrupt. When the last TD for the URB completes, BEI is cleared, and > > > > we get an interrupt for the whole URB. > > > > > > > > However, under a Panther Point xHCI host controller, if the parent hub > > > > is unplugged when one or more events from transfers with BEI set are on > > > > the event ring, a port status change event is placed on the event ring, > > > > but no interrupt is generated. This means URBs stop completing, and the > > > > USB device disconnect is not noticed. Something like a USB headset will > > > > cause mplayer to hang when the device is disconnected. > Alan, any more questions on this patch? I'd like to get it (and a > couple other bug fixes) pushed to Greg this week before the 3.7 merge > window. No more questions. I misunderstood your description of the problem, that's all. But it's already too late for Greg's 3.7 merge window... Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
