/*********************************************************************
 *
 * Filename:      irproc.c
 * Version:       1.0
 * Description:   Various entries in the /proc file system
 * Status:        Experimental.
 * Author:        Thomas Davis, <ratbert@radiks.net>
 * Created at:    Sat Feb 21 21:33:24 1998
 * Modified at:   Sun Nov 14 08:54:54 1999
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 *
 *     Copyright (c) 1998-1999, Dag Brattli <dagb@cs.uit.no>
 *     Copyright (c) 1998, Thomas Davis, <ratbert@radiks.net>,
 *     All Rights Reserved.
 *
 *     This program is free software; you can redistribute it and/or
 *     modify it under the terms of the GNU General Public License as
 *     published by the Free Software Foundation; either version 2 of
 *     the License, or (at your option) any later version.
 *
 *     I, Thomas Davis, provide no warranty for any of this software.
 *     This material is provided "AS-IS" and at no charge.
 *
 ********************************************************************/

#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/module.h>
#include <linux/init.h>
#include <net/net_namespace.h>

#include <net/irda/irda.h>
#include <net/irda/irlap.h>
#include <net/irda/irlmp.h>

extern const struct file_operations discovery_seq_fops;
extern const struct file_operations irlap_seq_fops;
extern const struct file_operations irlmp_seq_fops;
extern const struct file_operations irttp_seq_fops;
extern const struct file_operations irias_seq_fops;

struct irda_entry {
	const char *name;
	const struct file_operations *fops;
};

struct proc_dir_entry *proc_irda;
EXPORT_SYMBOL(proc_irda);

static const struct irda_entry irda_dirs[] = {
	{"discovery",	&discovery_seq_fops},
	{"irttp",	&irttp_seq_fops},
	{"irlmp",	&irlmp_seq_fops},
	{"irlap",	&irlap_seq_fops},
	{"irias",	&irias_seq_fops},
};

/*
 * Function irda_proc_register (void)
 *
 *    Register irda entry in /proc file system
 *
 */
void __init irda_proc_register(void)
{
	int i;

	proc_irda = proc_mkdir("irda", init_net.proc_net);
	if (proc_irda == NULL)
		return;

	for (i = 0; i < ARRAY_SIZE(irda_dirs); i++)
		(void) proc_create(irda_dirs[i].name, 0, proc_irda,
				   irda_dirs[i].fops);
}

/*
 * Function irda_proc_unregister (void)
 *
 *    Unregister irda entry in /proc file system
 *
 */
void irda_proc_unregister(void)
{
	int i;

	if (proc_irda) {
		for (i=0; i<ARRAY_SIZE(irda_dirs); i++)
			remove_proc_entry(irda_dirs[i].name, proc_irda);

		remove_proc_entry("irda", init_net.proc_net);
		proc_irda = NULL;
	}
}


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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>sound</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound/soc?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>soc</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/intel?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>intel</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/intel/common?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>common</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/intel/common/sst-acpi.c?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>sst-acpi.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='07cd12945551b63ecb1a349d50a6d69d1d6feb4a'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Tejun Heo &lt;tj@kernel.org&gt;</td><td class='right'>2017-01-26 16:47:28 -0500</td></tr>
<tr><th>committer</th><td>Tejun Heo &lt;tj@kernel.org&gt;</td><td class='right'>2017-01-26 16:47:28 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/intel/common/sst-acpi.c?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>07cd12945551b63ecb1a349d50a6d69d1d6feb4a</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/soc/intel/common/sst-acpi.c?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>75f65eba7eac9277971082a2d5a4cf1370562c0c</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/soc/intel/common/sst-acpi.c?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>sound/soc/intel/common/sst-acpi.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/intel/common/sst-acpi.c?id=7ce7d89f48834cefece7804d38fc5d85382edf77'>7ce7d89f48834cefece7804d38fc5d85382edf77</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/intel/common/sst-acpi.c?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a&amp;id2=7ce7d89f48834cefece7804d38fc5d85382edf77'>diff</a>)</td></tr></table>
<div class='commit-subject'>cgroup: don't online subsystems before cgroup_name/path() are operational</div><div class='commit-msg'>While refactoring cgroup creation, a5bca2152036 ("cgroup: factor out
cgroup_create() out of cgroup_mkdir()") incorrectly onlined subsystems
before the new cgroup is associated with it kernfs_node.  This is fine
for cgroup proper but cgroup_name/path() depend on the associated
kernfs_node and if a subsystem makes the new cgroup_subsys_state
visible, which they're allowed to after onlining, it can lead to NULL
dereference.

The current code performs cgroup creation and subsystem onlining in
cgroup_create() and cgroup_mkdir() makes the cgroup and subsystems
visible afterwards.  There's no reason to online the subsystems early
and we can simply drop cgroup_apply_control_enable() call from
cgroup_create() so that the subsystems are onlined and made visible at
the same time.

Signed-off-by: Tejun Heo &lt;tj@kernel.org&gt;
Reported-by: Konstantin Khlebnikov &lt;khlebnikov@yandex-team.ru&gt;
Fixes: a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") 
Cc: stable@vger.kernel.org # v4.6+
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>Diffstat</a> (limited to 'sound/soc/intel/common/sst-acpi.c')</div><table summary='diffstat' class='diffstat'>