Amit Nagal wrote: > i am trying to do digital audio streaming over usb audio class interface . > > when i stream audio , kernel produces these logs very frequently . > > ALSA sound/usb/usbaudio.c:351: frame 0 active: -18 . > > upon seeing documentation , -18 comes to be EXDEV (#define EXDEV > 18 /* Cross-device link */) . This error code is documented in Documentation/usb/error-codes.txt: | -EXDEV ISO transfer only partially completed | look at individual frame status for details Well, this _is_ the individual frame status. Anyway, a look at the source code shows that several HCDs use this code for frames that were not handled by the controller, probably because they were submitted too late. Which controller are you using? Is there anything that could cause the controller to skip frames, such as high traffic on the (PCI) bus? Regards, Clemens -- 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
