The authors and publishers of Linux Device Drivers 4th Edition do not endorse or support any unauthorized distribution of their book. This guide is for educational purposes only, and you should respect the intellectual property rights of the authors and publishers. If you're unable to find a free PDF version of the book, consider purchasing a copy from an authorized retailer.
Why? The kernel moves too fast. By the time a book about Linux device drivers is printed, several subsystems have already changed their APIs. Maintaining a printed 4th edition would be a Sisyphean task. Linux Device Drivers 4th Edition Pdf Github
I understand you're looking for the PDF of (often abbreviated LDD4) via GitHub. The authors and publishers of Linux Device Drivers
While you won't find an official 4th Edition PDF, GitHub remains an invaluable resource for this topic in two specific ways: Maintaining a printed 4th edition would be a Sisyphean task
Community-led GitHub repositories effectively serve as the "living 4th edition" by updating the book’s examples to work with current kernels:
The demand for a 4th edition is understandable. LDD3 was written for Linux kernel 2.6.10, released in late 2004. Since then, the kernel has evolved dramatically, introducing the device tree, the devm_* API for managed resources, the removal of the Big Kernel Lock (BKL), and major changes in the USB, PCI, and GPIO subsystems. By 2010, much of LDD3 was obsolete. Recognizing this, Jonathan Corbet and Greg Kroah-Hartman—the surviving authors after Alessandro Rubini stepped back—began drafting updates. These drafts, informally labeled "LDD4," were made available online under a Creative Commons license.
If you are a kernel developer searching for this resource, here is the full context of why it's missing, where you can find modern alternatives, and how GitHub still plays a role in keeping the classic 3rd Edition relevant. The Mystery of the 4th Edition