On Tue, Dec 24, 2002 at 12:48:57AM +0100, Oliver Neukum wrote:
>
> > However, it doesn't fix the crash with read/write after
> > disconnect ("Unable to handle kernel paging request at virtual address
> > 5a5a5a5a"). The crash happens everytime when disconnecting the scanner
> > during actual scanning.
> >
> > That's because of "scn = file->private_data;" in scanner_read and
> > scanner_write. The structure to which scn points now was kfreed in
> > disconnect_scanner...
> >
> > I haven't found any way to "tell" read/write that the device was
> > disconnected without keeping the scn data until close_scanner() is
> > called. That's why I didn't include the "owner: THIS_MODULE" in this
> > patch.
> >
> > Any ideas to do that without keeping the scn data around until the
> > final close?
>
> You cannot.
> Either keep the descriptors around, or don't use file->private_data
> and go through the array indexed by minors always.
Ah, but that array is now gone in 2.5 :)
thanks,
greg k-h
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