void value not ignored as it ought to be.

[taousif]

Hi,

I have written a small character driver, in the cleanup module at the line

int a=unregister_chrdev(Major,DEVICE_NAME);

I am getting the following error
error: void value not ignored as it ought to be

If the value return by unregister_chrdev() function is not stored in any variable it is working fine...

Please help.
Thank you.

[mnemo]

unregister_chrdev() returns void, so when you assign it to a variable you get an error; simply do,

unregister_chrdev(Major, DEVICE_NAME);

Note: Some man pages say unregister_chrdev() returns an integer, but,
- Obviously it doesn't,
- Kernel functions change often, and are poorly documented, so some man pages are out of date.

[taousif]

Thank you very much.