centos man page for wait_event_lock_irq_cmd

WAIT_EVENT_LOCK_IRQ_(9) 					   Driver Basics					   WAIT_EVENT_LOCK_IRQ_(9)

NAME
       wait_event_lock_irq_cmd - sleep until a condition gets true. The condition is checked under the lock. This is expected to be called with
       the lock taken.

SYNOPSIS
       wait_event_lock_irq_cmd(wq, condition, lock, cmd);

ARGUMENTS
       wq
	   the waitqueue to wait on

       condition
	   a C expression for the event to wait for

       lock
	   a locked spinlock_t, which will be released before cmd and schedule and reacquired afterwards.

       cmd
	   a command which is invoked outside the critical section before sleep

DESCRIPTION
       The process is put to sleep (TASK_UNINTERRUPTIBLE) until the condition evaluates to true. The condition is checked each time the waitqueue
       wq is woken up.

       wake_up has to be called after changing any variable that could change the result of the wait condition.

       This is supposed to be called while holding the lock. The lock is dropped before invoking the cmd and going to sleep and is reacquired
       afterwards.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   WAIT_EVENT_LOCK_IRQ_(9)