On Mon, Aug 8, 2011 at 5:52 PM, Matěj Laitl <matej@xxxxxxxx> wrote: > 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) Does this patch fix the problem for you? http://git.kernel.org/?p=linux/kernel/git/tiwai/sound-2.6.git;a=commitdiff;h=15439b Thanks, Daniel -- 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
