input_handler_for_each_handle — handle iterator
| int input_handler_for_each_handle ( | struct input_handler * handler, | 
| void * data, | |
| int (*fn) (struct input_handle *, void *)); | 
handlerinput handler to iterate
datadata for the callback
fnfunction to be called for each handle
   Iterate over bus's list of devices, and call fn for each, passing
   it data and stop when fn returns a non-zero value. The function is
   using RCU to traverse the list and therefore may be using in atomic
   contexts. The fn callback is invoked from RCU critical section and
   thus must not sleep.