On Thu, Oct 20, 2011 at 2:25 AM, Kai Meyer <[email protected]> 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<[email protected]> 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 > > [email protected] > > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > _______________________________________________ > Kernelnewbies mailing list > [email protected] > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >
During cleanup i think you need to call function unregister_chrdev_region(). Regards, Rohan Puri
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