1CANCEL_WORK_SYNC(9)              Driver Basics             CANCEL_WORK_SYNC(9)
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NAME

6       cancel_work_sync - block until a work_struct´s callback has terminated
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SYNOPSIS

9       int cancel_work_sync(struct work_struct * work);
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ARGUMENTS

12       work
13           the work which is to be flushed
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DESCRIPTION

16       Returns true if work was pending.
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18       cancel_work_sync will cancel the work if it is queued. If the work´s
19       callback appears to be running, cancel_work_sync will block until it
20       has completed.
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22       It is possible to use this function if the work re-queues itself. It
23       can cancel the work even if it migrates to another workqueue, however
24       in that case it only guarantees that work->func has completed on the
25       last queued workqueue.
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27       cancel_work_sync(delayed_work->work) should be used only if ->timer is
28       not pending, otherwise it goes into a busy-wait loop until the timer
29       expires.
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31       The caller must ensure that workqueue_struct on which this work was
32       last queued can´t be destroyed before this function returns.
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35Kernel Hackers Manual 2.6.         June 2019               CANCEL_WORK_SYNC(9)
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