If you read this review in two years, this book is no longer up-to-date.
Actually, some contents is already outdated when I write this review - but that's life in the Linux Kernel: it changes at an amazing speed.
Venkateswaran does a good job at trying to be as complete as possible - He discussed how to write a driver for almost any of the subsystems (char device, network device, compact flash, USB, wifi, etc). Every discussion tries to bring in as much of the material as possible. That's good, but it also has its negative side as I noticed several small errors in the discussions. In general, this is a great book - it really is enough to bring you up-to-speed with driver development for Linux. In details, it is even greater as you'll find almost any subsystem documented.