Comments on: char driver problem… https://www.emblogic.com/blog/10/char-driver-problem/ Embedded System and ARM Training Mon, 07 Oct 2013 04:00:03 +0000 hourly 1 http://wordpress.org/?v=3.9.1 By: kamran https://www.emblogic.com/blog/10/char-driver-problem/#comment-320 Fri, 07 Oct 2011 19:07:50 +0000 http://emblogic.org/blog/?p=884#comment-320 //this part of the code is creating the trouble
cdev_del(&scull_dev_ptr[loopv].cdev_var);
kfree(scull_dev_ptr);
unregister_chrdev_region(dev,NO_OF_DEVICES);

The second argument is NO_OF_DEVICE, since
NO_OF_DEVICE is set to some value say 3.
You are doing that loopv times.

Which will give you error.
use unregister_chrdev_region without the for loop.

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