Hi Daniel,
thank you for your quick answer!
On 7. 8. 2011 Daniel Mack wrote:
> On Sun, Aug 7, 2011 at 11:04 PM, Matěj Laitl <matej@xxxxxxxx> wrote:
> > every time I try to play a sound file though a NI Audio 4 DJ USB
> > soundcard (snd-usb-caiaq module) that is connected to a NEC Corporation
> > uPD720200 USB 3.0 Host Controller (xhci-hcd module), the system
> > completely hangs. dmesg reports stalls or hard lockups on cpu 0;
> > magic-sysrq-key doesn't work, but tasks on other cpus still apparently
> > run. The card runs in the USB 2.0 (480M) mode.
>
> Did you try this with any other USB2 high-speed sound card, a DVB
> receiver, a webcam or hardware like USB sticks or external HDDs? The
> device uses isochronous transfers, and the driver doesn't do anything
> fancy with it, so it would help a lot to know whether other
> hardware/drivers are also affected.
USB mass storage works okay, but none of other devices I have probably uses
isochronous transfers.
> Next thing to try would be whether it makes any difference if you
> never queue any outbound URBs (in sound/usb/caiaq/audio.c).
Yup, that prevents lockups (and playback, obviously). IMO the bug lies in
xhci, so I'll stop CCing you. (I only CCed you originally in case you had a
xhci controller to test out)
Regards,
Matěj
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