Since the official 4th Edition does not exist, here is a review of your best alternatives:
Q: Is the 4th edition of "Linux Device Drivers" available on Github? A: Yes, the 4th edition of "Linux Device Drivers" is available on Github.
The project was reportedly halted because the Linux kernel evolves so rapidly that printed material becomes obsolete before publication. Any "LDD4 PDF" found on
However, LDD3 was published in 2005. It covers the 2.6.x kernel. Today’s Linux kernel has evolved significantly, rendering much of the original code in LDD3 non-functional on modern systems. Is There an Official 4th Edition?
A: No. GitHub hosts source code, not for-sale PDFs. You will find drafts and course materials, but not the finished O’Reilly PDF.
The Linux kernel moves fast. Books freeze. Code lives. GitHub is your living, breathing Linux Device Drivers 4th Edition .
While not drivers-specific, this O’Reilly book (also by Greg KH) is free online and covers building and configuring the kernel – a prerequisite for driver development.