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Hi David,
Thanks a lot for your help! Your latest patch behaves exactly the same as
the previous one, i.e. I get a flood of
printer.c: usblp0: failed reading printer status
Again, rmmod usb-ohci stops the message flood, and also produces an oops.
Sincerely, Anders
> Thanks for testing this, Anders!
>
> > I did my usual "cat /boot/bzImage > /dev/usb/lp0" immediately after
> > turning my printer off, which usually results in an oops and a kernel
> > lockup. With David's patch, however, the kernel just got busy
> > printing the line over and over again:
> >
> > printer.c: usblp0: failed reading printer status
>
> Looks like usblp_write() line 402 should verify the printer is still
> present before calling usblp_check_status and looping. That
> also explains why unplug/replug did nothing: It's holding the
> semaphore that usblp_disconnect() needs to get to do its job,
> tying up khubd...
>
>
> > rmmod usbcore printer usb-ohci
> >
> > Besides from stopping the error messages, this also produced an oops,
> > see the data below about this.
>
> Which fingers that same bad usblp_check_status() call.
>
> Updated patch attached. That usblp_write() routine looks iffier to me
> the more I look at it ...
>
> - Dave
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