Am Dienstag, 14. März 2006 22:24 schrieb Alan Stern:
> On Tue, 14 Mar 2006, Alan Stern wrote:
>
> > > > acm_tty_close tty=cd254af8 filp=ce96511c acm=ce24eca0
> > > > acm_tty_close acm->used=1 acm->dev=00000000
> > > atm_tty_close called from tty_io.c:release_dev()
> > > acm->used=1 on entry, decrements to zero == final close
> > > acm->dev is NULL (unplugged) so call tty_unregister_device()
> >
> > The disconnect routine shouldn't need to set acm->dev to NULL. The fact
> > that the first disconnect has already occurred can be detected by the fact
> > that acm = usb_get_intfdata(intf) will itself be NULL.
> >
> > Will everything work if you simply delete the line
> >
> > acm->dev = NULL;
> >
> > from acm_disconnect()?
>
> After looking at the code, I see that it won't. The acm_tty_close()
> routine uses acm->dev to tell whether or not the USB device has been
> disconnected. The problem is that when acm->dev is NULL, it calls
> acm_tty_unregister() which requires acm->dev to be non-NULL.
Maybe I am dense, but what is acm->dev used for in acm_tty_unregister()?
Regards
Oliver
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