Question

I am new in the kernel-programming, so I would like to find out what coding style is more acceptable. For example, in case of the error handling which of the following is better?

This one:

/* some stuff */
if(error) {
    /* error handling */
    return -(errorcode);
}
/* normal actions */

or this one:

/* some stuff */
if(!error) {
    /* normal actions */
} else {
    /* error handling */
    return -(errorcode);
}

Where can I find any document, that regards to kernel coding standard?

Answer 1

Linux kernel has a coding style guide:

https://www.kernel.org/doc/Documentation/process/coding-style.rst

Nicer Formatted Version

Regarding your example, I personally prefer the first style. With the second style you will quickly violate this Linux kernel style rule (kernel style has 8-character indentation):

if you need more than 3 levels of indentation, you’re screwed anyway, and should fix
your program.

Writing code from top to bottom (as opposed to horizontally) is sometimes referred as duffing. I can suggest you this excellent reading on the subject:

Reading Code From Top to Bottom