On Wed, Feb 24, 2016 at 05:33:11PM +0530, Sudip Mukherjee wrote:

On Wed, Feb 24, 2016 at 5:27 PM, Navy Cheng [off-list ref] wrote:

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On Tue, Feb 23, 2016 at 09:43:56PM -0800, Greg KH wrote:

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On Wed, Feb 24, 2016 at 12:57:42PM +0800, Navy Cheng wrote:

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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?

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    sudo lsmod | grep dgnc

Does that show anything?

Output: dgnc                   65536  0

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    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.