Is there a bug in dgnc.ko?

[Navy Cheng]

On Wed, Feb 24, 2016 at 05:33:11PM +0530, Sudip Mukherjee wrote:
> On Wed, Feb 24, 2016 at 5:27 PM, Navy Cheng <navych at 126.com> wrote:
> > On Tue, Feb 23, 2016 at 09:43:56PM -0800, Greg KH wrote:
> >> On Wed, Feb 24, 2016 at 12:57:42PM +0800, Navy Cheng wrote:
> >> > Hi,
> >> >
> >> > My kernel version is v4.4, and I have built drivers/staging/dgnc/dgnc.ko.
> >> > I change to *dir*/drivers/staging/dgnc and do like this:
> >> >
> >> >     sudo insmod ./dgnc.ko
> >>
> >> Do you have the hardware that this driver controls?
> >
> > I'm not sure. My laptop is Dell Inspiron 14R - 5437 and I don't know if
> > there is the right hardware. I often don't know about what a driver is used
> > for in drivers/staging/. Is there any good way to know the function of a
> > driver or module?
> >
> >>
> >> >     sudo lsmod | grep dgnc
> >>
> >> Does that show anything?
> >
> > Output: dgnc                   65536  0
> >
> >> >     sudo rmmod ./dgnc
> 
> what did dmesg showed after you did rmmod?
> 

*dmesg* show nothing after I rmmod dgnc. I guess something wrong with
dgnc_cleanup_module() which is called when dgnc is removed.