CANCEL_WORK_SYNC(9) Driver Basics CANCEL_WORK_SYNC(9)NAMEcancel_work_sync - cancel a work and wait for it to finish
bool cancel_work_sync(struct work_struct * work);
the work to cancel
Cancel work and wait for its execution to finish. This function can be
used even if the work re-queues itself or migrates to another
workqueue. On return from this function, work is guaranteed to be not
pending or executing on any CPU.
cancel_work_sync(delayed_work->work) must not be used for
delayed_work's. Use cancel_delayed_work_sync instead.
The caller must ensure that the workqueue on which work was last queued
can't be destroyed before this function returns.
true if work was pending, false otherwise.
COPYRIGHTKernel Hackers Manual 3.8. June 2014 CANCEL_WORK_SYNC(9)