blk_sync_queue(9) - phpMan
BLK_SYNC_QUEUE(9) Block Devices BLK_SYNC_QUEUE(9)
blk_sync_queue - cancel any pending callbacks on a queue
void blk_sync_queue(struct request_queue * q);
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 elevator_exit and blkcg_exit_queue to be called with
queue lock initialized.
Kernel Hackers Manual 4.8. January 2017 BLK_SYNC_QUEUE(9)