Am Samstag, 13. M�rz 2004 09:25 schrieb Greg KH:
> On Fri, Mar 12, 2004 at 08:41:11PM -0800, Pete Zaitcev wrote:
> > Greg,
> >
> > I do not like my monkeying with the helper task, so
> > I am investigating a backport from 2.6 to 2.4.
> >
> > I see that the hateful semaphore is gone. The disconnect is guarged by
> > a kobject, so this is good. However, what about the port->open_count?
> > It is manipulated without any locking, it seems.
>
> Actually it can be gotten rid of entirely I think. The reference count
> of the object is now handled properly, so open_count is pretty much
> pointless. Now we are still relying on the fact that open() can't race
> with disconnect() from the USB bus, which in real-life is probably ok,
> but I'm not so sure anymore in theory due to the BKL removal work in
> various upper portions of the 2.6 kernel. You should be fine for 2.4
> though.
Probably you are not safe even on 2.4.
Disconnect() is very likely to block, which drops BKL.
Regards
Oliver
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