usb audio class driver problem

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Hi ,

i am using  a usb composite device having usb - hid and usb - audio interface
with linux machine as usb host .

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 */) .

whenever this problem comes , the kernel does not crash but sound
glitch comes ,
and then system automatically recovers after some time  , and audio is
resumed .

can i be guided , why this problem comes and  how to solve this problem .

waiting for reply .

thanx & regards

amit nagal
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