Am Mittwoch, 10. September 2003 05:27 schrieb Greg KH:
> On Wed, Sep 10, 2003 at 12:38:18PM +1000, Mark McDougall wrote:
> > Hi All,
> >
> > I'm having problems unlinking in my device driver.
> >
> > My driver submits a number of IN urbs on device open (up to 16) and
> > simply appends data in a buffer in the callback function before
> > re-submitting another urb (not the same one - an 'idle' one).
> >
> > However, when closing the device and attempting to unlink the urbs, I am
> > getting kernel panics. Sometimes they occur on close (unlink), and other
> > times on module exit (probably on free_urb).
> >
> > Are there any known race conditions in usb_unlink_urb()? (I saw
> > reference to one in passing in a msg on this mailing list)
You could miss URBs that are submitted from the callbacks.
You need mutual exclusion of completion handlers and
disconnect handlers.
HTH
Oliver
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