It doesn't exactly apply here since the author doesn't seem to be allocating resources dynamically, but another thing that's "newer" and less widely used are th

It doesn't exactly apply here since the author doesn't seem to be allocating resources dynamically, but another thing that's "newer" and less widely used are the devm_ family of functions. Nowadays, lots of code could be using devm_kmalloc, devm_ioremap, etc which will release the resources automatically when the driver detaches from the device.