/*
 * u_gether.h
 *
 * Utility definitions for the subset function
 *
 * Copyright (c) 2013 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com
 *
 * Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef U_GETHER_H
#define U_GETHER_H

#include <linux/usb/composite.h>

struct f_gether_opts {
	struct usb_function_instance	func_inst;
	struct net_device		*net;
	bool				bound;

	/*
	 * Read/write access to configfs attributes is handled by configfs.
	 *
	 * This is to protect the data from concurrent access by read/write
	 * and create symlink/remove symlink.
	 */
	struct mutex			lock;
	int				refcnt;
};

#endif /* U_GETHER_H */
/a> : <a href='/cgit.cgi/linux/net-next.git/'>net-next.git</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='f1712c73714088a7252d276a57126d56c7d37e64'/><select name='h' onchange='this.form.submit();'>
<option value='emaclite-cleanup'>emaclite-cleanup</option>
<option value='master'>master</option>
<option value='nds-private-remove' selected='selected'>nds-private-remove</option>
<option value='packet-loop-back'>packet-loop-back</option>
<option value='packet-rx-pump-back'>packet-rx-pump-back</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>net-next plumbings</td><td class='sub right'>Tobias Klauser</td></tr></table>
<table class='tabs'><tr><td>
<a href='/cgit.cgi/linux/net-next.git/?h=nds-private-remove'>summary</a><a href='/cgit.cgi/linux/net-next.git/refs/?h=nds-private-remove&amp;id=f1712c73714088a7252d276a57126d56c7d37e64'>refs</a><a href='/cgit.cgi/linux/net-next.git/log/include/trace/events/btrfs.h?h=nds-private-remove'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/include/trace/events/btrfs.h?h=nds-private-remove&amp;id=f1712c73714088a7252d276a57126d56c7d37e64'>tree</a><a class='active' href='/cgit.cgi/linux/net-next.git/commit/include/trace/events/btrfs.h?h=nds-private-remove&amp;id=f1712c73714088a7252d276a57126d56c7d37e64'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/include/trace/events/btrfs.h?h=nds-private-remove&amp;id=f1712c73714088a7252d276a57126d56c7d37e64'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/include/trace/events/btrfs.h'>
<input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='f1712c73714088a7252d276a57126d56c7d37e64'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=f1712c73714088a7252d276a57126d56c7d37e64'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include?h=nds-private-remove&amp;id=f1712c73714088a7252d276a57126d56c7d37e64'>include</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/trace?h=nds-private-remove&amp;id=f1712c73714088a7252d276a57126d56c7d37e64'>trace</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/trace/events?h=nds-private-remove&amp;id=f1712c73714088a7252d276a57126d56c7d37e64'>events</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/trace/events/btrfs.h?h=nds-private-remove&amp;id=f1712c73714088a7252d276a57126d56c7d37e64'>btrfs.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='f1712c73714088a7252d276a57126d56c7d37e64'/><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>Eric Dumazet &lt;edumazet@google.com&gt;</td><td class='right'>2017-01-27 08:11:44 -0800</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-01-29 18:30:56 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/trace/events/btrfs.h?h=nds-private-remove&amp;id=f1712c73714088a7252d276a57126d56c7d37e64'>f1712c73714088a7252d276a57126d56c7d37e64</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/trace/events/btrfs.h?id=f1712c73714088a7252d276a57126d56c7d37e64'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=f1712c73714088a7252d276a57126d56c7d37e64'>962ee49daf8d1cba8403fcf03b315d4a142ec944</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/trace/events/btrfs.h?h=nds-private-remove&amp;id=f1712c73714088a7252d276a57126d56c7d37e64'>include/trace/events/btrfs.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/trace/events/btrfs.h?h=nds-private-remove&amp;id=dc97a89e726c4e1830320d1db8215ef77ecebae0'>dc97a89e726c4e1830320d1db8215ef77ecebae0</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/trace/events/btrfs.h?h=nds-private-remove&amp;id=f1712c73714088a7252d276a57126d56c7d37e64&amp;id2=dc97a89e726c4e1830320d1db8215ef77ecebae0'>diff</a>)</td></tr></table>
<div class='commit-subject'>can: Fix kernel panic at security_sock_rcv_skb</div><div class='commit-msg'>Zhang Yanmin reported crashes [1] and provided a patch adding a
synchronize_rcu() call in can_rx_unregister()

The main problem seems that the sockets themselves are not RCU
protected.

If CAN uses RCU for delivery, then sockets should be freed only after
one RCU grace period.

Recent kernels could use sock_set_flag(sk, SOCK_RCU_FREE), but let's
ease stable backports with the following fix instead.

[1]
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [&lt;ffffffff81495e25&gt;] selinux_socket_sock_rcv_skb+0x65/0x2a0

Call Trace:
 &lt;IRQ&gt;
 [&lt;ffffffff81485d8c&gt;] security_sock_rcv_skb+0x4c/0x60
 [&lt;ffffffff81d55771&gt;] sk_filter+0x41/0x210
 [&lt;ffffffff81d12913&gt;] sock_queue_rcv_skb+0x53/0x3a0
 [&lt;ffffffff81f0a2b3&gt;] raw_rcv+0x2a3/0x3c0
 [&lt;ffffffff81f06eab&gt;] can_rcv_filter+0x12b/0x370
 [&lt;ffffffff81f07af9&gt;] can_receive+0xd9/0x120
 [&lt;ffffffff81f07beb&gt;] can_rcv+0xab/0x100
 [&lt;ffffffff81d362ac&gt;] __netif_receive_skb_core+0xd8c/0x11f0
 [&lt;ffffffff81d36734&gt;] __netif_receive_skb+0x24/0xb0
 [&lt;ffffffff81d37f67&gt;] process_backlog+0x127/0x280
 [&lt;ffffffff81d36f7b&gt;] net_rx_action+0x33b/0x4f0
 [&lt;ffffffff810c88d4&gt;] __do_softirq+0x184/0x440
 [&lt;ffffffff81f9e86c&gt;] do_softirq_own_stack+0x1c/0x30
 &lt;EOI&gt;
 [&lt;ffffffff810c76fb&gt;] do_softirq.part.18+0x3b/0x40
 [&lt;ffffffff810c8bed&gt;] do_softirq+0x1d/0x20
 [&lt;ffffffff81d30085&gt;] netif_rx_ni+0xe5/0x110
 [&lt;ffffffff8199cc87&gt;] slcan_receive_buf+0x507/0x520
 [&lt;ffffffff8167ef7c&gt;] flush_to_ldisc+0x21c/0x230
 [&lt;ffffffff810e3baf&gt;] process_one_work+0x24f/0x670
 [&lt;ffffffff810e44ed&gt;] worker_thread+0x9d/0x6f0
 [&lt;ffffffff810e4450&gt;] ? rescuer_thread+0x480/0x480
 [&lt;ffffffff810ebafc&gt;] kthread+0x12c/0x150
 [&lt;ffffffff81f9ccef&gt;] ret_from_fork+0x3f/0x70

Reported-by: Zhang Yanmin &lt;yanmin.zhang@intel.com&gt;
Signed-off-by: Eric Dumazet &lt;edumazet@google.com&gt;
Acked-by: Oliver Hartkopp &lt;socketcan@hartkopp.net&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=f1712c73714088a7252d276a57126d56c7d37e64'>Diffstat</a> (limited to 'include/trace/events/btrfs.h')</div><table summary='diffstat' class='diffstat'>