unlocked_ioctl vs normal ioctl

Question

In my driver\'s file_operations structure, I have:

struct file_operations Fops = {
  read:    device_read,
  write:   device_write,
  unlocked_ioctl:   device_io         


        

Answer 1

Andi Kleem posted a recipe for a quick-and-dirty conversion of code using ioctl to unlocked_ioctl on Linux kernel mailing list:

[JANITOR PROPOSAL] Switch ioctl functions to ->unlocked_ioctl

The recipe explains how to tweak the function's parameters and insert locking and unlocking calls.