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 sudo lsmod | grep dgnc sudo rmmod ./dgnc sudo insmod ./dgnc.ko After I re-insmod the dgnc module, my laptop is breakdown. My OS is debian 8.0. Is there a bug in dgnc.ko or something wrong with my OS or kernel. If there is a bug, How can I find it? Thanks.
On Wed, 24 Feb 2016 12:57:42 +0800, Navy Cheng said:
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
What output, if any, did this generate?
sudo lsmod | grep dgnc
Again, what messages?
sudo rmmod ./dgnc
Again, what happened?
sudo insmod ./dgnc.ko
And here?
After I re-insmod the dgnc module, my laptop is breakdown.
What does "breakdown" mean? Did it hang entirely? Did you get a message in your dmesg output and/or on the console? Other?
My OS is debian 8.0. Is there a bug in dgnc.ko or something wrong with my OS or kernel. If there is a bug, How can I find it?
Start by providing enough info to see if there's a bug.
On Wed, Feb 24, 2016 at 12:37:40AM -0500, Valdis.Kletnieks@vt.edu wrote:
On Wed, 24 Feb 2016 12:57:42 +0800, Navy Cheng said:
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
What output, if any, did this generate?
No output. I use *dmesg* to find more information: [ 572.915977] dgnc: module is from the staging directory, the quality is unknown, you have been warned.
sudo lsmod | grep dgnc
Again, what messages?
Output: dgnc 65536 0
sudo rmmod ./dgnc
Again, what happened?
No output. After *dmesg*, no more info in the ring buffer.
sudo insmod ./dgnc.ko
And here?
No output.
After I re-insmod the dgnc module, my laptop is breakdown.
What does "breakdown" mean? Did it hang entirely? Did you get a message in your dmesg output and/or on the console? Other?
The GUI stop work and any key in my laptop is not work. The *Caps Lock lamp* in the keyboard is flashing.
My OS is debian 8.0. Is there a bug in dgnc.ko or something wrong with my OS or kernel. If there is a bug, How can I find it?
Start by providing enough info to see if there's a bug.
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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?
sudo lsmod | grep dgnc
Does that show anything?
sudo rmmod ./dgnc sudo insmod ./dgnc.ko
After I re-insmod the dgnc module, my laptop is breakdown.
Then there's a bug to fix in the driver, it must not clean up everything properly. Based on a quick read of it, there is lots of things that need to be fixed in it, that's why it is in staging. If you are interested, I would suggest fixing this issue would be a great start. good luck! greg k-h
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 sudo insmod ./dgnc.ko
After I re-insmod the dgnc module, my laptop is breakdown.
Then there's a bug to fix in the driver, it must not clean up everything properly. Based on a quick read of it, there is lots of things that need to be fixed in it, that's why it is in staging. If you are interested, I would suggest fixing this issue would be a great start.
I'm very glad to get your advice to fix this issue. As a kernelnewbies, I have sent two patches about code cleaning to you, and they are merged to the kernel tree. I realy interested to fix this bug to improve my understanding of the kerenl. Thank you.
On Wed, Feb 24, 2016 at 5:27 PM, Navy Cheng <navych@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? regards sudip
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@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.
On Wed, Feb 24, 2016 at 07:57:01PM +0800, Navy Cheng 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?
If you don't think you have the hardware, then almost always, you don't have the hardware, it's pretty simple :)
sudo lsmod | grep dgnc
Does that show anything?
Output: dgnc 65536 0
Great, it loaded, then crashes when you unload, congratulations, you can now work on fixing that bug! good luck, greg k-h
participants (4)
-
Greg KH -
Navy Cheng -
Sudip Mukherjee -
Valdis.Kletnieks＠vt.edu