task_work_cancel

Name:ask_work_cancel - cancel a pending work added by task_work_add()*@task: the task which should execute the work*@func: identifies the work to remove* Find the last queued pending work with ->func == @func and remove* it from queue.* RETURNS:

Proto:struct callback_head *task_work_cancel(struct task_struct *task, task_work_func_t func)

Type:struct callback_head

Parameter:

Type	Parameter	Name
struct task_struct *	task
task_work_func_t	func

pprev = task_works

If Value is more likely to compile time(!task_works) Then Return NULL

raw_spin_lock_irqsave( & Protection of the PI data structures: , flags)

When work = READ_ONCE( * pprev) cycle

If func != func Then pprev = next

Else if cmpxchg(pprev, work, next) == work Then Break

raw_spin_unlock_irqrestore( & Protection of the PI data structures: , flags)

Return work

**Caller**
Name	Describe
irq_thread	Interrupt handler thread

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Function report