Am Donnerstag, 20. Dezember 2007 16:32:50 schrieb Alan Stern:
> On Thu, 20 Dec 2007, Oliver Neukum wrote:
>
> > Hi,
> >
> > the mos7720 driver sends two commands to the device whenever it is
> > closed. It does so unconditionally even if the device has been disconnected.
> > It seems to me that this is wrong. Making sure that this does not happen
> > for disconnected devices takes a bit of infrastructure in the generic part.
> > However I am not sure whether this interfeeres with hanging up the tty.
> > What do you think?
>
> There's nothing wrong with trying to send those commands if the device
> really is disconnected. The attempts will fail quickly.
>
> The problem arises when the device is still connected but the driver
> has been unbound. That is illegal; a driver is never supposed to
> access a device once its unbind method has returned.
Exactly, but as a driver cannot (and should not) notice the difference,
we must consider any IO after disconnect wrong.
> Do other serial drivers suffer from a similar problem?
I probably would have noticed, but I didn't specifically look for it.
Regards
Oliver
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