From: Greg Kroah-Hartman
> On Fri, Dec 05, 2014 at 09:03:57PM +0100, Sebastian Andrzej Siewior wrote:
> > Consider the following scenario:
> > - plugin a webcam
> > - play the stream via gst-launch-0.10 v4l2src device=/dev/video0
> > - remove the USB-HCD during playback via "rmmod $HCD"
> >
> > and now wait for the crash
>
> Which you deserve, why did you ever remove a kernel module? That's racy
> and _never_ recommended, which is why it never happens automatically and
> only root can do it.
Really drivers and subsystems should have the required locking (etc) to
ensure that kernel modules can either be unloaded, or that the unload
request itself fails if the device is busy.
It shouldn't be considered a 'shoot self in foot' operation.
OTOH there are likely to be bugs.
David
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