Am Montag, 23. Juni 2003 19:39 schrieb Tuukka Toivonen:
> Can usb_disconnect() and usb_probe() functions of a driver pre-empt the
> driver in other parts? I mean, that if user has just called my open()
> function in the driver, could usb_disconnect() happen before the system
> call returns?
Yes. Probe() and disconnect() will not preempt each other. Anything else
is possible.
> If usb_disconnect() can happen while already executing in open(), and if
> the former frees the data structures used by the driver, then the latter
> call might continue working with already freed memory region which could
> lead to catastrophe.
>
> So I guess it is not possible, but I'd like to have a confirmation. Also
> if somebody would care to explain a little why it isn't possible, would be
> nice.
It is possible. Appropriate locking in device drivers is a very good idea.
HTH
Oliver
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