On Sun, 2016-01-03 at 17:22 +0100, Johan Hovold wrote:
> On Mon, Dec 21, 2015 at 02:17:22PM +0100, Oliver Neukum wrote:
> > Disconnecting a device is not just a hang up. The device is gone.
> > We should tell user space the truth immediately.
>
> I'm not sure about this one. The usb-serial drivers have always returned
> -EIO on hangup, whatever the reason, and there's nothing wrong with
> that implementation.
>
> Also note that any further ioctls after returning will also fail with
> -EIO.
>
> I think it makes sense to just stick to -EIO here.
But write() is happy to return -ENODEV. I'd say that -EIO
is the error return of last resort. If we have anything specific
to report we ought to use it. And if a device is gone, it is gone.
There is no use hiding it.
Regards
Oliver
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