I do call unregister_chrdev_region. There are 5 functions in my original email that I call during the life of my module. Still no luck. -Kai Meyer On 10/19/2011 09:47 PM, rohan puri wrote:
On Thu, Oct 20, 2011 at 2:25 AM, Kai Meyer <kai@gnukai.com <mailto:kai@gnukai.com>> wrote:
Unfortunately I can't share the source code, it belongs to the company I work for.
All of cdev_init, cdev_del, and unregister_chrdev_region are void functions, so they have no return value.
I check the return value of alloc_chrdev_region and cdev_add and check for errors with BUG_ON (for now).
-Kai Meyer
On 10/19/2011 02:18 PM, Daniel Baluta wrote: > On Wed, Oct 19, 2011 at 7:04 PM, Kai Meyer<kai@gnukai.com <mailto:kai@gnukai.com>> wrote: >> I can't seem to get my character device to remove itself from the >> /proc/devices list. I'm calling all of the following functions like so: >> >> alloc_chrdev_region(&dev, 0, 5, "my_char"); >> cdev_init(&my_cdev,&my_ops); >> cdev_add(&my_cdev, MKDEV(my_major, my_minor), 1); >> cdev_del(&my_cdev); >> unregister_chrdev_region(my_major, 5); >> >> It seems like I'm missing something, but I can't find it. I'm >> referencing the Linux Device Drivers v3, chapter 3. In the example code, >> the scull_cleanup_module function calls cdev_dell and >> unregister_chrdev_region, just like I do. >> >> To be clear, after I unload my module (after calling cdev_del and >> unregister_chrdev_region), my "my_char" string still shows up in >> /proc/devices. > Did you check return codes for all functions? > Also, can you post a link to the code? > > thanks, > Daniel. > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@kernelnewbies.org <mailto:Kernelnewbies@kernelnewbies.org> > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
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During cleanup i think you need to call function unregister_chrdev_region().
Regards, Rohan Puri
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