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usb isochronous devices


I am trying to use an iMic USB sound card with the Etrax MCM. The
major/minor numbers are registered properly, however when I try to read or
write to/from the sound driver I eventually get kernel panics or apparently
infinite loops. Before this lots of either
 - usb-host.c: assert failed at line 1679
 - usb-host.c: Ignoring NULL urb, or
 - usb-host.c: Out of synch? Previous frame = 1880, current frame = 1889
(numbers vary, the current always seems to be previous+9 rather than the
expected previous+5).
warning messages are printed out.

I have tried both kernel 4.2.19 and 4.2.22 with usbhost.c version 1.19.
Before going further with my testing/debugging I thought it would be a good
idea to get your feedback on this as well. Are there any known issues with
isochronous devices?



Mahmut Fettahlioglu
Senior Software Engineer

Open Access Pty Ltd
PO Box 301
Crows Nest NSW 1585

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