/*
 * All the USB notify logic
 *
 * (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de>
 *
 * notifier functions originally based on those in kernel/sys.c
 * but fixed up to not be so broken.
 *
 * Released under the GPLv2 only.
 * SPDX-License-Identifier: GPL-2.0
 */


#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/notifier.h>
#include <linux/usb.h>
#include <linux/mutex.h>
#include "usb.h"

static BLOCKING_NOTIFIER_HEAD(usb_notifier_list);

/**
 * usb_register_notify - register a notifier callback whenever a usb change happens
 * @nb: pointer to the notifier block for the callback events.
 *
 * These changes are either USB devices or busses being added or removed.
 */
void usb_register_notify(struct notifier_block *nb)
{
	blocking_notifier_chain_register(&usb_notifier_list, nb);
}
EXPORT_SYMBOL_GPL(usb_register_notify);

/**
 * usb_unregister_notify - unregister a notifier callback
 * @nb: pointer to the notifier block for the callback events.
 *
 * usb_register_notify() must have been previously called for this function
 * to work properly.
 */
void usb_unregister_notify(struct notifier_block *nb)
{
	blocking_notifier_chain_unregister(&usb_notifier_list, nb);
}
EXPORT_SYMBOL_GPL(usb_unregister_notify);


void usb_notify_add_device(struct usb_device *udev)
{
	blocking_notifier_call_chain(&usb_notifier_list, USB_DEVICE_ADD, udev);
}

void usb_notify_remove_device(struct usb_device *udev)
{
	/* Protect against simultaneous usbfs open */
	mutex_lock(&usbfs_mutex);
	blocking_notifier_call_chain(&usb_notifier_list,
			USB_DEVICE_REMOVE, udev);
	mutex_unlock(&usbfs_mutex);
}

void usb_notify_add_bus(struct usb_bus *ubus)
{
	blocking_notifier_call_chain(&usb_notifier_list, USB_BUS_ADD, ubus);
}

void usb_notify_remove_bus(struct usb_bus *ubus)
{
	blocking_notifier_call_chain(&usb_notifier_list, USB_BUS_REMOVE, ubus);
}
0fdf989e528e'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/?id=03c95dbef64264b6d86d50c0f0d90fdf989e528e'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/'>
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<tr><th>author</th><td>Bjorn Andersson &lt;bjorn.andersson@linaro.org&gt;</td><td class='right'>2017-02-01 07:27:47 -0800</td></tr>
<tr><th>committer</th><td>Kalle Valo &lt;kvalo@qca.qualcomm.com&gt;</td><td class='right'>2017-02-07 10:59:26 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=03c95dbef64264b6d86d50c0f0d90fdf989e528e'>03c95dbef64264b6d86d50c0f0d90fdf989e528e</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=03c95dbef64264b6d86d50c0f0d90fdf989e528e'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=03c95dbef64264b6d86d50c0f0d90fdf989e528e'>a9147ea324fb1aa1f552067280c35a52a0fb664d</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=7f622593cc5add77a99cd39404e8a851be9de792'>7f622593cc5add77a99cd39404e8a851be9de792</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=03c95dbef64264b6d86d50c0f0d90fdf989e528e&amp;id2=7f622593cc5add77a99cd39404e8a851be9de792'>diff</a>)</td></tr></table>
<div class='commit-subject'>wcn36xx: Implement cancel_hw_scan</div><div class='commit-msg'>In the even that the wcn36xx interface is brought down while a hw_scan
is active we must abort and wait for the ongoing scan to signal
completion to mac80211.

Reported-by: Mart Raudsepp &lt;leio@gentoo.org&gt;
Fixes: 886039036c20 ("wcn36xx: Implement firmware assisted scan")
Signed-off-by: Bjorn Andersson &lt;bjorn.andersson@linaro.org&gt;
Signed-off-by: Kalle Valo &lt;kvalo@qca.qualcomm.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=03c95dbef64264b6d86d50c0f0d90fdf989e528e'>Diffstat</a></div><table summary='diffstat' class='diffstat'>