blk_sync_queue
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## Name

blk_sync_queue — cancel any pending callbacks on a queue

## Synopsis

`void blk_sync_queue (` | struct request_queue * q`)`;

## Arguments

`q`

  the queue

## Description

The block layer may perform asynchronous callback activity on a queue, such as calling the unplug function after a timeout. A block device may call blk_sync_queue to ensure that any such activity is cancelled, thus allowing it to release resources that the callbacks might use. The caller must already have made sure that its ->make_request_fn will not re-add plugging prior to calling this function.

This function does not cancel any asynchronous activity arising out of elevator or throttling code. That would require `elevaotor_exit` and `blkcg_exit_queue` to be called with queue lock initialized.

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