I don't know if you've been in the open-source space for very long, because this is not how it works. It's pretty standard to work very hard to give credit (and not some silly "reporter" credit) to the first person to show up with a working patch for an issue (as long as they are willing to work with the maintainers and make requested changes), because it builds goodwill in the community and encourages contributions. Of course, the kernel maintainers are free to break that social compact, but it's still "robbing" someone of what social norms lead one to expect. And this "robbery" isn't a victimless act, either. Finding a high-complexity (and it was, don't confuse yourself) issue and solving it is a good undertaking that shows that you're a good developer, and also brings some spotlight to the company you represent, which can be good for recruiting and developer relations.