Re: BUG when USB devices disconnected ?

[Vojtech P. <vo...@su...>]

On Mon, Jan 28, 2002 at 09:58:39PM +0100, Johann Deneux wrote:
> Hi,
> 
> When I turn off my I-Force wheel while a process having opened its
> /dev/input/eventX entry is still running, strange things happen. I made
> trials with evtest and fftest. Both crash. They either crash immediately,
> on exit or when I press a key on my keyboard. Other strange behaviours are
> mouse clicks being uneffective, the wm unwilling to change focus (I use
> sloppy focus). The pointer of the mouse goes on moving, however.
> All this happens with a patched 2.4.17 kernel (with my input-only
> patch). I will try to see what happens with the latest CVS version as soon
> as I can get it working.

Just use 2.5.2-dj6, it's all there ...

> Anyway, I think there should be a test on evdev->exist in every entry
> function (evdev_read, ioctl, write, release, flush ...). Adding these
> tests did not solve the problem, though.

That shouldn't be needed. The structs associated are freed only after
the file descriptor is closed.

> Can someone try to reproduce the bug with another USB device ?
> (Advice: sync your disks before! The crash is actually a complete freeze)

It works for me. Evtest just reports:

evtest: error reading: No such device

and exits just OK.

-- 
Vojtech Pavlik
SuSE Labs