'\" t
.\"     Title: blk_sync_queue
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Block Devices
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "BLK_SYNC_QUEUE" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Block Devices"
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.SH "NAME"
blk_sync_queue \- cancel any pending callbacks on a queue
.SH "SYNOPSIS"
.HP \w'void\ blk_sync_queue('u
.BI "void blk_sync_queue(struct\ request_queue\ *\ " "q" ");"
.SH "ARGUMENTS"
.PP
\fIq\fR
.RS 4
the queue
.RE
.SH "DESCRIPTION"
.PP
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\&.
.PP
This function does not cancel any asynchronous activity arising out of elevator or throttling code\&. That would require
\fBelevator_exit\fR
and
\fBblkcg_exit_queue\fR
to be called with queue lock initialized\&.
.SH "COPYRIGHT"
.br